Eighteen-Month-Old Joey, Sitting at the Breakfast Table One Morning, Suddenly

Eighteen-month-old Joey, sitting at the breakfast table one morning, suddenly moves a piece of toast across his plate while saying "vroom, vroom!" This behavior most likely indicates that Joey

A) is in the sensorimotor stage
B) has been watching too much television with his older brother
C) is engaging in pretend/symbolic play
D) is demonstrating a form of social play