Given the task definition and input, reply with output. The task is about reading the given context, group and MCQs and then generating answers from the given input. MCQs are multiple choice questions in which a question is asked and few options are given, among which one or in some cases more than one can be the answer.

context: Four people are walking at identical speeds. The first walks around a mountain, the second walks around a house, the third walks around a book, and the fourth walks around a microwave.<sep>group: circumference <sep>question: Which takes the longest amount of time to walk around?<sep>A: mountain<sep>B: house<sep>C: book<sep>D: microwave

The mountain takes the longest amount of time to walk around.