Reordering of sentences (climate policy and transport): arrange P, Q, R and S to form a coherent paragraph between S1 and S6. S1: The climate question presents a leapfrog era for the development paradigm of India. S6: This presents a good template for India, building on its existing plans to introduce electric mobility through buses first, and cars by 2030.

Introduction / Context:
This paragraph is about climate action in India and international efforts to decarbonise transport. The jumbled sentences P, Q, R and S must be ordered so that the text moves smoothly from India's renewable energy ambitions to new transport initiatives and their goals, before concluding with S6 about electric mobility.

Given Data / Assumptions:

• S1: The climate question presents a leapfrog era for the development paradigm of India.
• S6: This presents a good template for India, building on its existing plans to introduce electric mobility through buses first, and cars by 2030.
• P: It is aimed at achieving a shift to sustainable fuels, getting cities to commit to eco friendly mobility and delivering more walkable communities, all of which will improve the quality of urban life.
• Q: At the Bonn conference, a new Transport Decarbonisation Alliance has been declared.
• R: This has to be resolutely pursued, breaking down the barriers to wider adoption of rooftop solar energy at every level and implementing net metering systems for all categories of consumers.
• S: Already, the country has chalked out an ambitious policy on renewable energy, hoping to generate 175 gigawatts of power from green sources by 2022.

Concept / Approach:
The logical progression is:

• From the general climate opportunity for India (S1).
• To India's existing renewable energy policy (S).
• To the need to pursue this policy seriously (R).
• To the international transport alliance (Q).
• To the objectives of that alliance (P), which then links smoothly into S6 about electric mobility.

Pronoun references also guide the order: \"This\" in R refers to the policy in S, and \"It\" in P refers back to the alliance in Q.

Step-by-Step Solution:
Step 1: S1 introduces the idea of a leapfrog era for India. The next logical sentence is S, which details India's ambitious renewable energy policy and target of 175 gigawatts from green sources. Step 2: R follows naturally because \"This\" refers to the policy described in S. R emphasises that this policy must be resolutely pursued by adopting rooftop solar and net metering. Step 3: After discussing domestic policy, the passage widens its scope to an international initiative. Q introduces the Transport Decarbonisation Alliance declared at the Bonn conference. Step 4: P explains what the alliance \"is aimed at\": shifting to sustainable fuels, promoting eco friendly mobility, and making cities more walkable. Step 5: The aims stated in P directly connect to S6, which describes a template for India in terms of electric mobility. This gives the overall sequence S1 → S → R → Q → P → S6, that is S R Q P.

Verification / Alternative check:
Any order where Q appears before S and R would jump too quickly from the general statement in S1 to an international initiative without first establishing India's own policy base. Similarly, if P comes before Q, the pronoun \"It\" in P lacks a clear antecedent, since the alliance has not yet been named. Therefore, S R Q P is the only order that respects both pronoun reference and argument structure.

Why Other Options Are Wrong:
Option \"S P R Q\": Here P would describe the aims of something that has not yet been introduced, making \"It\" unclear. Option \"P R S Q\": This would place the alliance's aims before explaining India's renewable energy policy, breaking the logical sequence from national efforts to global initiatives. Option \"Q R S P\": In this order, R's \"This\" cannot clearly refer back to S, and S appears too late, disrupting the narrative about India's policy background.

Common Pitfalls:
In multi theme paragraphs, candidates sometimes try to keep all sentences about one topic together. However, good writing may interleave national and international contexts as long as pronouns and logical references are clear. Always track what each \"This\" and \"It\" refers to when deciding the order.

Final Answer:
The correct sequence of the middle sentences is S R Q P, producing a coherent discussion of India's climate policy and the Transport Decarbonisation Alliance.