Statement: "Do not lean out of the moving train." - A warning in the railway compartment.
Assumptions:
1. Such warnings will have some effect.
2. Leaning out of a moving train is dangerous.
3. It is the duty of railway authorities to take care of passengers' safety.
Answer: E
The warning against leaning out of moving train is made to heed against the dangers involved. So, both I and II are implicit. Since the warning has been put up in the railway compartment, so III is also implicit.