Which is a result of a seasonal change (meaning a change that happens over and over at a certain time of year)

D. Frogs digging into mud to hibernate in the winter

Option D

Explanation:

The frogs digging into mud to hibernate in winters. This is a result of seasonal change in which the cold blooded animals go into hibernation during winters as they cannot maintain their body temperature with respect to the changing environment.

Frogs cannot regulate the temperature of its body as it is a cold blooded animal so frogs hide themselves to save its energy and return back in summer season.

This is a result of seasonal change that occurs once in a year.

the answer to your question is:

c. complementary base-pairing

sorry, but you do not have posted the diagram.