She was playing by herself under a tree just as she been playing the day cholera broke out. she was making heaps of earth and pa
ths for the garden and basil came and stood near to watch her. presently he got rather interested and suddenly made a suggestion. which future event does this passage use foreshadow A. Mary will no longer want to play by herself.
The answer is definitely not B as Basil already suggested something. We aren't sure D will happen because nothing would imply that he will make her mad. So that leaves A and C. Mary seems to already know how to garden "she was making heaps of earth and paths for the garden" so I believe the answer would be A.