Question

Who owns the book on subject U? 

• A. B
• B. E
• C. D
• D. C
• E.

Hint:

Look for clues about positions (top, bottom) to eliminate incorrect options. Often, this will help identify who owns which book.

Answer 1

The Correct Option is C

We are told that the book on subject U is neither owned by B nor A, and that D's book is at the bottom of the stack. Thus, D must own the book on subject U. All the conditions point to D as the correct answer. 
Thus, the correct answer is (c) D. 

Answer 2

We are told directly that the book on subject U is owned by neither B nor A, and that D's book sits at the very bottom of the stack.

1. Option A (B): B is explicitly excluded from owning U by the given condition, so this is ruled out.
2. Option B (E): Nothing establishes E as the owner of U, and since a definite owner (D) is already fixed by the bottom-of-stack condition, E cannot also be it.
3. Option C (D): D's book is fixed at the bottom, and U is the subject left to be assigned there, so D fits.
4. Option D (C): C's book has already been placed at the top of the stack (established earlier), so C cannot also own the book at the bottom; this is ruled out.

With B and A excluded, and C already fixed elsewhere, D remains the only owner consistent with U being at the bottom.

Hence, the correct answer is D.