Among A, B, C, D and E, who is the heaviest?
I. C is heavier than only
A.
II. D is lighter than B but heavier than C and E.

We will analyse both the statements separately I. As per this statement, we can conclude that C is heavier than only A and the rest are heavier than C so we cannot conclude that who is the heaviest of them all. So, this option will get eliminated individually. II. As per this statement we, can conclude this: B > D > C and E From this analysis, we cannot conclude who is the heaviest So this option will also get eliminated individually Now, we will combine both these statements and we can conclude this: B >  D >  E >  C >  A So, answer is B is the heaviest So, we need both these statements to answer the question