Answer: C

The most difficult part of this question is understanding the work you have to do. "Consecutive terms," when not modified by a word like "even," refers to consecutive integers, such as 1 and 2 or 101 and 102. There are three pairs of consecutive terms back-to-back in this sequence: 4 and 5, 5 and 6, and -3 and -4. That's 3 pairs, making (C) the right choice.