Q: You are presented with the quiz "When do many trees respond to the days growing shorter?" But you don't know the answer, so you turn to your teacher to ask for hints. He says that "many plants respond to the days growing shorter in the fall by going dormant" and "trees are dormant from November to March". So, what's the best answer to the question?

Select from the following. A. air cools. B. Winter. C. wind. D. in fall. E. in summer. F. autumn. G. late winter. H. in spring.
The answer is:
D.