Definition: In this task, you will be presented with a question that has multiple possible answers. You should choose the most suitable option out of "A", "B", "C", "D", and "E", based on your commonsense knowledge.
Input: Question: If one needed the bathroom they needed a key, to get it they had to also buy something from the what? 
 Options: A school B rest area C convenience store D mall E theater 
Output:
C