Now That Lindsey Has a Boyfriend, She Has Stopped Making

Now that Lindsey has a boyfriend, she has stopped making an effort to keep her female friends. Her best friend, Eileen tried to speak with Lindsey about this, but Lindsey has made it clear that she will spend all of her time with her boyfriend. Since Lindsey is no longer comfortable associating with Eileen, she will not answer her phone or accept text messages. What defense mechanism is Lindsey displaying?

A) Reaction formation.
B) Avoidance.
C) Distancing.
D) Psychological withdrawal.