What Does It Mean for a Trait to Be Both

What does it mean for a trait to be both polygenic and multifactorial?

A) Multiple genes each produce aspects of a trait,and environmental factors influence the expression of those genes.
B) One gene determines a trait,but it can show a range of variation depending on which hormones are present.
C) Several alleles exist for a gene,and the expression of the trait is determined by how a single environmental factor interacts with the alleles.
D) A single allele is responsible for a specific trait,but its expression can be altered by multiple environmental factors.
E) Two genes both influence a trait as long as a specific hormone is present in the correct quantity.