I went to my grandparent 's house for supper last night . It was my grandmother 's 92nd birthday . I was happy to find that the leaves had started to change and fall in her neighborhood , so I got some pictures .
According to the above context, choose the best option to answer the following question.
Question: why did the leaves start falling ?
Options:
A. because it was likely the fall season
B. because it was the birthday of his family member
C. because it was raining
D. None of the above choices .


A