The Heritability Index for Major Depressive Disorder Is Approximately

The heritability index for major depressive disorder is approximately .37,meaning that:

A) genetic factors are 37% more important than environmental factors in determining depression.
B) parents with major depressive disorder have a 37% chance of producing a child with major depressive disorder.
C) major depressive disorder is completely the result of genes for 37% of the population.
D) 37% of the population variability in major depressive disorder can be attributed to genetics.