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.

[EX Q]: Sentence: A shopping cart rolls by itself across a parking lot. Then it gets to a field. The cart rolls only a little more after it enters the field. Question: Why does this happen? (A) the parking lot is a rougher surface (B) the field is a rougher surface
[EX A]: the field is a rougher surface

[EX Q]: Sentence: The wheels of a shopping cart heat up quite a bit when rolling through the parking lot, but quite a bit less when rolling around on the store floor. Question: Which surface is providing less friction? (A) parking lot (B) store floor
[EX A]: store floor

[EX Q]: Sentence: Joe left his house at nine A.M. and had been driving for hours by the time Sue finally got on the road at 1:00 P.M. By 2:00 P.M., Question: who had driven the furthest amount of miles? (A) Joe had driven the furthest (B) Sue had driven the furthest
[EX A]:
Joe had driven the furthest