You are given a sentence, a question and two answer options. Your task is to write down the index ('A' or 'B') of the **incorrect** option for the given question.

Sentence: A jet is faster then a prop plane. Question: If both fly around for the same amount of time, which will have gone farther? (A) jet (B) prop plane
B

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
A

Sentence: Flash the superhero is the fastest man in the world. He races a bear. Question: Who wins this race? (A) Flash (B) Bear

B