1. 

Statement:  Most people who stop smoking gain weight.

Assumptions: 

I. If one stops smoking one will gain weight.

II. If one does not stop smoking, one will not gain weight.

A. Only assumption I is implicit.
B. Only assumption II is implicit.
C. Either I or II is implicit.
D. Neither I nor II is implicit.
E. Both I and II are implicit.

Answer: Option D

Explanation:

The statement talks of 'most people' and not 'all'. So, I is not necessarily true. Thus, I is not implicit. The condition, if one does stop smoking, cannot be deduced from the statement. So, II is also not implicit.