Quincy Is Writing a Research Report About Parental Investment and Learns

Quincy is writing a research report about parental investment and learns that the investment for humans is really large,with most children requiring care until they're in their 20's.Given this great investment,parents want to invest in their own offspring,and NOT another person's children.What piece of evidence supports this belief?

A) Infants are more likely to respond to biological parents than adoptive parents.
B) Fathers are more likely to teach skills to their sons than their daughters.
C) Infants are more likely to be murdered by a stepfather than a biological father.
D) Mothers are more likely to feed their oldest child over their youngest child.