Detailed Instructions: 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.
Q: Sentence: Sara likes to throw her sponge ball around. After a while, she notices that rolls more quickly on her on her driveway so she had to chase it, then when she's playing on the grass. Question: Which surface has the greatest resistance? (A) concrete driveway (B) grass?
A:
grass