Best description of natural selection is

A)

Survival of the fittest

B)

Struggle for existence

C)

Change in proportion of variations within a population

D)

Reproductive success of the member of a population best adapted to the environment

Dear student 

Best description of natural selection is the reproductive success of the member of a population best adapted to the environment. Darwin's theory is mainly adapted to evolution.
Natural selection is the gradual process by which biological traits become either more or less common in a population as a function of the effect of inherited traits on the differential reproductive success of organisms interacting with their environment. It is a key mechanism of evolution. A process fundamental to evolution as described by Charles Darwin. By natural selection, any characteristic of an individual that allows it to survive to produce more offspring will eventually appear in every individual of the species, simply because those members will have more offspring.