A Sharp Contrast Between Balanced Polymorphism and the Three Types

A sharp contrast between balanced polymorphism and the three types of natural selection is that in balanced polymorphism,

A) polygenic traits in a population may mask the observation of extreme or intermediate phenotypes.
B) Not only are multiple alleles persistent in a population, but they may preserve positive, neutral, and negative phenotypes.
C) multiple alleles of a gene persist indefinitely in a population.
D) many traits persist in a population that are controlled by only a single allele.
E) positive, neutral, and negative phenotypes may be preserved in a population.