Instructions: 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.
Input: Sentence: The wheels of a shopping cart heat up quite a bit when rolling through the parking lot, but quite a bit less when rolling around on the store floor. Question: Which surface is providing less friction? (A) parking lot (B) store floor
Output:
A