|A) If the data in statement I alone are sufficient to answer the question||B) If the data in statement II alone are sufficient answer the question|
|C) If the data either in I or II alone are sufficient to answer the question;||D) If the data in both the statements together are needed.|
From I. we have A <B< D.
From II. we have C < B
Combining( I) and (II), we can conclude that D is the heaviest
So. both the statements are needed