Considering That Numerous Chromosomes Have Genetic Markers That Are Associated

Considering that numerous chromosomes have genetic markers that are associated with unipolar depression, which inference may we draw about the link between genetic factors and depression?

A) The genetic basis for depression is stronger than other factors that are linked to depression.
B) Genetic screening should be used to identify those individuals who are at risk for developing depression.
C) Genetic factors alone are insufficient to explain why some people become depressed during their lifetime.
D) People with genetic markers for depression are destined to develop depression at some point in their lifetime.