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'.

[EX Q]: Sentence: Bob took his toy car outside to play with it. He rolled it on the street and then he rolled it in the grass. He noted that the toy car rolled much faster in the street. Question: Which surface caused more friction? (A) The street (B) The grass
[EX A]: B

[EX Q]: Sentence: Two bunnies, a white one and a black one, are hopping along together. The black bunny goes further than the white one. Question: Which bunny is faster? (A) white bunny (B) black bunny
[EX A]: B

[EX Q]: Sentence: Sarah was playing jacks on the rug. The ball bounced away and rolled on the rug, then onto the linoleum kitchen floor nearby. The rug had more resistance than the kitchen floor. Question: Which surface was smoother? (A) rug (B) linoleum kitchen floor
[EX A]:
B