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.

Sentence: A dog toy thrown across a grassy field travels at a lower rate of speed compared to one thrown across a dirt field. Question: Which field is the least rough? (A) grassy field (B) dirt field
dirt field

Sentence: Mark is walking towards a forest and spots a large tree from 100 yards away. He continues to walk towards the tree, stands two yards away and looks at it. Question: At which point will the tree appear larger? (A) 100 yards away (B) 2 yards away
2 yards away

Sentence: Karen was running late so she knew she should take the red bus instead of the blue one. Question: Which bus is more likely to be the express bus? (A) The red bus (B) The blue bus

The red bus