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.

[EX Q]: Sentence: Jim is a young boy who loves camping with his father. They often throw rocks into the river. Question: Who can throw the rocks the furthest? (A) Jim's Father (B) Jim
[EX A]: B

[EX Q]: Sentence: It's easy to stab a pin into a pin cushion, but it's hard to stab one into a pillow. Question: Which surface will make the pin get hotter when stabbing into it? (A) pin cushion (B) pillow
[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]:
A