Answer: Age
Explanation: Age always goes up, but doesn't go down.
C) We listen, whenever we are driving, to books on tape.
I'd say B and D. Elementary school reports don't necessarily equate to knowledge of a subject (and research on the branches of government doesn't help you know <em>how</em> to govern), so A is out. C is nice, but popularity and charm do not a leader make, he might have ulterior motives to being as such, maybe taking advantage of the power? B and D show things he has done that would give him useful skills in the position.
The right answer is C.The problem or Danger....Believe me i took the test