1.  Questions : How is M related to N ?
Statements: 

I.  B is the daughter of M and sister of Q.
II. N is the son of K who is B's grandfather.

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 D

Explanation:

From II, we know that N is K's son and K is B's grandfather . Thus, N is the son of B's grandfather i.e. N is Either father or uncle of B.

From I, B is the daughter of M. So, M is either father or mother of B.

Clearly, the correct relationship between m and N cannot be deduced.