Four of the five factors below support the mechanism of natural selection. In contrast, the fifth factor blocks natural selection from occurring. Which one of the factors listed below does NOT lead to natural selection, but instead stops it from occurring?

(A) Characteristics are inherited passed from parent to offspring.
(B) Organisms in a population are identical to each other.
(C) There is competition among organisms in a population.
(D) More offspring are born than can survive.
(E) Organisms in a population vary in characteristics that affect how well they survive and reproduce.