Who among the following possesses the book on subject T?
B or E
Since the book on subject T is between the books on subjects P and Q, and C's book is at the top, this implies that B or E could possess the book on subject T. Given that C's book is at the top and B or E are the only ones left to satisfy the conditions for subject T, it follows that B or E could be the owners.
Thus, the correct answer is (d) B or E.
