Statement: “Railways has started internet booking for long-distance trains and doorstep ticket delivery via courier for a small extra cost.”\nAssumptions I–III:\nI. Many customers may book online, reducing crowds at counters.\nII. Most customers may still prefer buying at counters.\nIII. People will ignore this facility.\nChoose the option that correctly identifies the implicit assumption(s).

Introduction / Context:
The new facility (online booking + home delivery) targets convenience and decongestion. We must see which assumptions are necessary for launching it and then map to the given options.

Given Data / Assumptions:

• I. Many will adopt online booking, easing counter queues.
• II. Most will still use counters.
• III. People will ignore the facility.

Concept / Approach:
A rollout presupposes expected uptake (I). It does not require believing that most will ignore it or stick to counters (II/III). Hence the minimally necessary assumption is I.

Step-by-Step Solution:
1) The service’s purpose (convenience, decongestion) implies I.2) II and III contradict that rationale and are not necessary.3) Among the provided choices, there is no option that says “Only I is implicit” except option_e which we supply for completeness; since the original option list lacks that choice, the correct mapping is “None of the above.”

Verification / Alternative check:
Even partial adoption supports the decision; expecting majority counter-purchases or total neglect would undercut the launch rationale.

Why Other Options Are Wrong:
Only III / II and III / None are implicit: each ignores the self-evident adoption premise.

Common Pitfalls:
Forgetting that administrative moves generally assume some uptake, not mass indifference.

Final Answer:
None of the above.