Mark (a) if the question can be answered from statement I alone
Mark (b) if question can be answered from statement II alone
Mark (c) if question can be answered using both statements together but not by using either statement alone
Mark (d) if the question cannot be answered by using both the statements.
What is the relation between A and B?
I. D is A’s grandfather.
II. B is D’s son.
Using I and II we can only infer that B is A’s grandfather’s son. Now B can be A’s uncle or A’s father thus the exact relationship is not known.
Option d