1.  Questions : Among A, B, C, D, E and F, who is the heaviest ?
Statements : 

I.  A and D are heavier than B, E and F but none of them is the heaviest.
II. A is heavier than D but lighter than C.

A. I alone is sufficient while II alone is not sufficient.
B. II Alone is sufficient while I alone is not sufficient.
C. Either I or II is sufficient.
D. Neither I nor II is sufficient.
E. Both I and II are sufficient.

Answer: Option A

Explanation:

From I, we conclude that since none of A and D, is the heaviest and each one of B, E and F is lighter than both A and D, so C is the heaviest.