The Estimated Broad-Sense Heritability for Milk Production in a Herd

The estimated broad-sense heritability for milk production in a herd of dairy cattle is high. Which of the following statements is a valid inference?

A) Most of the variation in milk production in the herd is due to additive genetic variance within the herd.
B) Most of the variation in milk production in the herd is due to dominant genetic variance.
C) Little of the variation in milk production is due to environmental variation within the herd.
D) Selective breeding for high milk production in this herd will be effective.
E) Broad-sense heritability for milk production will be high in most other herds of dairy cattle.