Which of the Following Would Render an Otherwise Nontaxable Scholarship/fellowship

Which of the following would render an otherwise nontaxable scholarship/fellowship at least partially taxable: I.The recipient is engaged in a post-doctoral research effort (i.e., not a degree candidate) .
II) The recipient used scholarship proceeds to pay for books
III) The recipient used scholarship proceeds to pay for room and board.

A) I.only
B) III.only
C) I.and II.only
D) I.and III.only
E) I., II.and III.