Concept:To decide who is the oldest, we need a complete comparison chain covering all four people.
Explanation:From Statement I: Bhavesh is older than Amit but younger than Dhiraj.
This gives
Dhiraj>Bhavesh>Amit.
Chandan is not compared, so Statement I alone is not sufficient.
From Statement II: Chandan is younger than Dhiraj but older than Amit.
This gives
Dhiraj>Chandan>Amit.
Bhavesh is not compared, so Statement II alone is not sufficient.
Combining both statements, we get
Dhiraj>Bhavesh>Amit and
Dhiraj>Chandan>Amit.
Thus, Dhiraj is older than Bhavesh, Chandan, and Amit.
So the oldest person is clearly Dhiraj.
Therefore, both statements together are sufficient to answer the question.
Answer:Option B: Data in both statements I and II together (and not statement I alone or statement II alone) are sufficient to answer the question.