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: A matchbox can slide across a greenhouse floor, but it doesn't move as fast as when it is slid across the backyard. Question: Which surface is the smoother one? (A) greenhouse floor (B) backyard
[EX A]: A

[EX Q]: Sentence: Mike's tank weighs much more than his motorcycle. Question: Which object takes longer to speed up? (A) motorcycle (B) tank
[EX A]: B

[EX Q]: Sentence: Mike races a man running on his sports motorcycle. Question: Who will reach the finish line a quarter mile away first? (A) Mike (B) Running Man
[EX A]:
A