Heritability Is the Proportion of the Total Phenotypic Variation in a Trait

Heritability is the proportion of the total phenotypic variation in a trait that is the result of:

A) genetic variation among individuals.
B) environmental variation among the individuals.
C) variation in the degree of dominance of different genes.
D) variation in the degree of epistasis among genes.
E) variation in the frequency of recombination between genes.