Detailed Instructions: 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").
Q: A bear's blubber (A) enables him to keep his body cozy (B) enables him to eat more (C) is useless and a burden to his health (D) makes it more difficult for the bear to function
A:
A