I think the answer is B but I'm not sure sorry
The period of daylight also determines the inclination of the Earth's axis. In each hemisphere's winter, daylight hours are shortest. The number of daylight hours decreases during the summer and winter solstice, and the rate of decrease is greater the higher the latitude. The less hours of sunshine, the warmer the evenings.
Sea snails help to keep the algae's population from growing to high. And the algae provides the sea snails with energy from the snails eating it as a food source.