Natural Selection Is BEST Described As

Natural selection is BEST described as:

A) the ability to generate new traits that better suit the species.
B) increasing the perfection of a species.
C) working on the existing variation of traits to favor those better suited to the organism's environment.
D) causing the death of a significant proportion of the population.
E) driving the species toward an eventual endpoint in which the species possesses the best possible adaptations for that particular environment.