Comparing typical pump grades — legacy figures: Textbook convention asks: the octane numbers of motor gasoline used in India and America are respectively taken as which of the following pairs (legacy comparison; not current market labels)?

Introduction / Context:
Octane rating systems and pump labelling vary by region and era (RON vs. MON vs. AKI). Many legacy exam questions use conventional pairings to contrast "typical" octane ratings cited historically for India and America. This question follows that tradition rather than present-day pump postings.

Given Data / Assumptions:

• Legacy textbook comparison rather than current regulatory labels.
• India conventionally cited with lower RON figures in older references; America often cited with higher representative numbers for premium grades.
• Answer reflects the exam convention.

Concept / Approach:
Within the conventional framing used in older petroleum MCQs, India is associated with about "87" and America with about "94" for motor gasoline octane numbers (reference grades). This should not be confused with today’s AKI labelling (e.g., 87/89/91 AKI in the U.S., roughly RON 91–98), but it matches the intended learning check in such questions.

Step-by-Step Solution:

Verification / Alternative check:
Historic course materials often contrasted regional octane practices using these nominal values; modern specs vary by grade and method.

Why Other Options Are Wrong:

Common Pitfalls:
Confusing RON with AKI; AKI is (RON + MON)/2 used on U.S. pumps today and is numerically lower than RON.

Final Answer:
87 & 94