Which of the Following Statements Is False

Which of the following statements is false?

A) Genetic diversity helps prevent a species from becoming extinct.
B) The phenomenon in which animals with favorable adaptation reproduce more rapidly is called differential reproduction.
C) Geographic isolation is a common mechanism contributing to speciation.
D) By definition, the fittest animals are the largest and strongest animals.
E) A change in environmental conditions can lead to adaptation only for traits already present in the gene pool of a population.