Which of the following statements about the heritability of major depressive disorder mdd) is true?

a. nearly 100% of people with genetic liability can be accounted for by the personality trait of dogmatism
b. nearly 50% of people with genetic liability can be accounted for by the personality trait of aggressiveness.
c. the heritability is approximately 40% and the personality trait of neuroticism accounts for a substantial portion of this genetic liability
d. the heritability of mdd depends on whether the individual's mother or father had mdd
e. less than 10% of people with genetic liability can be accounted for by the personality trait of perfectionism.