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: Brock is dragging a toy behind him. He pulls it across the smooth tile floor, then on the gravel driveway outside. Question: Where is Brock able to drag the toy faster? (A) tile floor (B) gravel driveway
A: 
tile floor