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: Two horses are being ridden out of the same barn. The white horse is going the same speed as the grey horse. The grey horse travels longer than the white horse. Question: Which horse went further? (A) white horse (B) grey horse
A: 
B