Q: In this task, you are given a multiple-choice question and you have to pick the correct option. Answer with option indexes (i.e., "A", "B", "C", and "D").
Winning a race requires you to be reach the finish line in a before your opponents, so using what will measure how much faster you win or lose by? (A) a rabbit (B) a cup (C) a cotton swab (D) a stopwatch
A:
D