Statement: Sachin's mother instructed him to return home by train if it rains heavily.
Assumptions:
1. Sachin may not be able to decide himself if it rains heavily.
2. The trains may ply even if it rains heavily.
Answer: B
Sachin's mother has instructed him as a matter of caution and out of care for her child, and not because Sachin himself would not be able to decide. So, I is not implicit. Besides, Sachin's mother instructs him to take to train journey in case it rains heavily. So, II is implicit