1.  Statement : "You must learn to refer to the dictionary if you want to become a good writer". - A advises B.
Assumptions : 

I. Only writers, refer to the dictionary.
II. All writer, good or bad, refer to the dictionary.

A. If only assumption I is implicit.
B. If only assumption II is implicit.
C. If either I or II is implicit.
D. If neither I nor II is implicit.
E. If both I and II are implicit.

Answer: Option D

Explanation:

It does not follow from the statement that only writers and nobody else refers to the dictionary. Also, nothing is mentioned about bad writers. So, neither I or II is implicit.