You will be given a definition of a task first, then an example. Follow the example to solve a new instance of the task.
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: A person is trying to stack flowers, eggs, balls, and books.<sep>group: stacking <sep>question: Which is the easiest to stack?<sep>A: flowers<sep>B: eggs<sep>C: balls<sep>D: books
Solution: Books are the easiest to stack.
Why? The answer relates to stacking which is mentioned in the group in the input.

New input: context: A person is trying to stack coins, boxes, books, and flowers.<sep>group: stacking <sep>question: Which are the hardest to stack?<sep>A: coins<sep>B: boxes<sep>C: books<sep>D: flowers
Solution:
The flowers are the hardest to stack.