Nico has a hard time asserting himself. He often goes along with his friends even if he does not want to do what they suggest. This has been going on for so long that now they do not even ask him what he wants to do when they are making plan. What principle does this example illustrate?
A.
Nico has terrible, inconsiderate friends.
B.
People will treat you however you let them.
C.
Nico needs to focus much more on self-care.
D.
Stress can have a negative impact on all relationships.