Derek's best friend Orlando let him down. Orlando chose to go to a concert with his brother instead of going to Derek's birthday dinner. The next day, Orlando phoned Derek's house. Derek told his mother, "Tell him I'm not here, I don't want to talk to him." This conflict is most likely: .
a. a regular part of adolescent social life.
b. a symptom of poor parenting.
c. indicative of a behavior disorder.
d. unusual in male friendships.