Bart, an 11-Month-Old, Is Playing on the Floor of His

Bart, an 11-month-old, is playing on the floor of his room when his older brother steers a remote-control car (that Bart has never seen) toward him. Bart immediately looks up at his father, who is on the verge of yelling, "Stop, it's going to hit Bart." Bart then breaks into quickly flowing tears. Bart has engaged
in:

A) emotional regulation.
B) self-socialization.
C) social referencing.
D) display rules.