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: A halter sliding across a barn floor gets hotter then one sliding across a field. Question: Which surface forces the halter to travel at a lower rate of speed? (A) barn floor (B) field

A: barn floor
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Q: Sentence: A space station has been abandoned and left to drift through space. At one point, the space station drifts halfway between a normal star and a black hole. The black hole is much more massive than is the normal star. Question: Which body will the space station drift away from because of that body's lower gravitational force? (A) black hole (B) normal star

A: normal star
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Q: Sentence: Tony and Alex are riding motorcycles across the country.  Tony rides until early afternoon, but Alex rides until nightfall. Question: Who rode farther? (A) Tony (B) Alex

A:
Alex
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