After Spending Time in This Class You Notice the Wide

After spending time in this class you notice the wide range of personalities in your family while attending a family gathering.During the gathering at Aunt Millie's home she insists on everyone singing traditional holiday songs together.The neurotic, the extraverted, the shy, the anxious, the open, and all of the other personality types in your family join in song at Aunt Millie's request.Her success at getting all of these personalities to join in song is due to the

A) common family environment.
B) social influence effect.
C) strong situation.
D) shared family environment.