In what type of organisms and environments does each type of reproduction prove to be the most beneficial for the survival of a species?

i'm thinking (a) to keep sand in place; ////////////

explanation: a sand fence or sandbreak, like a snow fence, is used to force windblown, drifting sand to accumulate in a desired place. sand fences are employed to control erosion, sand dune stabilization, keep sand off roadways, and to recruit new material in desert areas.

the cell cycle is the final answer! : )

yes, because even though a theory has a  lot of evidence to support it, it is not always true