Compared to People in Close Exchange Relationships, People in Close

Compared to people in close exchange relationships, people in close communal relationships ____.

A) do not necessarily help one another more or keep better track of "who does what for whom" in the relationship
B) help one another more but do not necessarily keep better track each other's needs
C) help one another more and keep better track of their partners' needs
D) help one another more and keep better track of "who does what for whom" in the relationship