Question

The book on which of the following subjects is kept on the top?

• A. T
• B. R
• C. U
• D. Data inadequate
• E.

Hint:

Use direct references to "top" and "bottom" positions to identify the correct placement in book arrangement problems. These clues are often key to solving such puzzles.

Answer 1

The Correct Option is B

C's book is at the top, and we are told that the book on subject R is immediately above the book on subject T. Based on the positioning of books and persons, it follows that the book on subject R must be kept at the top. This is the only arrangement that satisfies the conditions for the books. 
Thus, the correct answer is (b) R. 

Answer 2

We know C's book sits at the top of the stack, and separately that the book on subject R sits immediately above the book on subject T.

1. Option A (T): T sits between the books on P and Q (established earlier), so it cannot be at the very top; this is ruled out.
2. Option B (R): Since R sits immediately above T, and T is not at the top, R is one position higher — matching C's book, which is fixed at the top.
3. Option C (U): U's book has already been placed at the bottom of the stack (owned by D), so it cannot be at the top; this is ruled out.
4. Option D (Data inadequate): Since C's position at the top, combined with the R-above-T relationship, is enough to pin down the top subject, the data is not inadequate; this option is wrong.

With T ruled out as being between P and Q, and U ruled out as being at the bottom, R — sitting immediately above T and matching C's fixed top position — must be the subject on top.

Hence, the correct answer is R.