Which Statement About Traits That Involve Polygenic Inheritance Is TRUE

Which statement about traits that involve polygenic inheritance is TRUE?

A) These traits are passed down from either the mother or the father directly to the offspring.
B) These traits are expressed only if an individual has a dominant gene.
C) Offspring have a one in four chance of possessing a trait if the parents possess it.
D) Many common human disorders are believed to result from interactions amongst multiple inherited genes, often in conjunction with environmental factors.