Children Who Enjoy Warm Interactions with Their Mother Tend to Have

Children who enjoy warm interactions with their mother tend to have a similar relationship with their siblings. What is the most likely explanation?

A) Such children are generally widely spaced and are thus not in competition.
B) Children produce an effect both on their mother and their siblings.
C) Such children are most likely to belong to a small family.
D) They may share similar personality traits conducive to interactional cooperation.
E) They model themselves after the mother and adopt kin-keeping skills.