1.  Statement : Whenever you have any doubt on this subject, you may refer to the book by Enn and Enn.
Assumptions :

I. The book by Enn and Enn is available.
II. There is no other book on this subject.

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 A

Explanation:

The recommendation of the book by Enn and Enn implies that it is available. So i is implicit. Also, the book has been referred to as a good one, but this does not mean that no other books are available on the subject. So, II is not implicit.