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").
Input: Sometimes, a black-tailed deer will caution other deer of danger by (A) waiting to hear sounds (B) slamming its front hoof to the ground (C) sending a text message (D) lying down on the ground
Output:
B