Answer: Option E.
Statement I lacks information regarding N and Q. Hence, I alone is not sufficient.
Statement II lacks information regarding M. Hence, II alone is not sufficient.
Now, from I and II, we get that T is the youngest.
So data in both the statements I and II together are necessary to answer the question.
Hence option E is the answer.
From statement 1st, we can draw
From statement 2nd, we can draw
Now combining both statements, we can conclude
Therefore T is the youngest, therefore both the statements are required to answer the question.