Instructions: You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct option for the given question. Write down the answer index: 'A' or 'B'.
Input: Sentence: Mary and Billy are at the beach skipping rocks.  Billy works out everyday, but Mary is weaker. Question: Who can throw the rocks farther? (A) Mary (B) Billy
Output:
B