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'.
Q: Sentence: A tortoise and a hare decided to race each other and the tortoise was slower. Question: Halfway through the race, which one had travelled further? (A) the tortoise (B) the hare
A: 
B