Geneticists Designate Heritability as "Narrow" or "Broad" to Account for the Fact

Geneticists designate heritability as "narrow" or "broad" to account for the fact that

A) genes contribute to different degrees. Typically, recessive alleles are rare and can have a large impact and dominant alleles tend to be common with minor but additive effects.
B) genes contribute to different degrees. Typically, dominant alleles are rare and have a small impact and recessive alleles tend to be common, each with major effects.
C) genes that determine body weight also affect many other phenotypes.
D) genes contribute to different degrees. Typically, dominant alleles are rare and can have a large impact and recessive alleles tend to be common with minor but additive effects.
E) dominant and recessive alleles have equal impact, but dominant alleles are more common than recessive alleles.