Answer:
The research question the reason best supports is the following one:
C. How much forest is being cut down for use as paper towels?
Explanation:
The reason shows one of the ways in which people could preserve their forest habitat: by switching to cloth towels instead of paper towels. It implies the reason expresses concern about what has been going on with forest habitats, and it aims at helping people find a way to preserve them. Therefore, the research question "How much forest is being cut down for use as paper towels?" is the one the reason best supports, since the reason shows an alternative to paper towels, which lead forest to being cut down: cloth towels.
