For a group of individuals, the heritability score for a particular trait = .5. What can be said about the heredity of this trait?

For a group of individuals, the heritability score for a particular trait = .5. What can be said about the heredity of this trait?

a. Hereditary differences account for all of the observed differences for this group of individuals.
b. Hereditary differences account for none of the observed differences for this group of individuals.
c. Hereditary differences account for some of the observed differences for this group of individuals.
d. The differences found within this group are mostly due to differences in the environment.