You are given a sentence, a question and two answer options ('A' and 'B'). Your task is to find the correct answer (return the string of the correct option, not 'A' or 'B') for the given question.

Sentence: A grassy field offers a smoother journey to a rabbit then a rocky path. Question: Which surface will let the rabbit stay cooler as it runs along it? (A) grassy field (B) rocky path
grassy field