Davis (Vietnamese American) and Bill (White American) are roommates but they never consider themselves as friends

Davis thinks that Bill is rude that he directly criticizes
how messy Davis's room is and how lazy Davis is even in front of friends of Davis. On
the other hand, Bill thinks that Davis is hard to get along because Davis never tells what
he really thinks or what he really wants. The challenge they face is:
a. Different definition of friendship
b. Different communication style
c. Stereotype
d. Discrimination

b___