When Carolyn Rovee-Collier and Other Researchers Use the Conjugate Reinforcement

When Carolyn Rovee-Collier and other researchers use the conjugate reinforcement technique, a baby demonstrates memory by

A) showing dishabituation to a familiar stimulus, measured in terms of sucking responses.
B) staring longer at a mobile that has never been seen before.
C) smiling more at a familiar stimulus than at an unfamiliar stimulus.
D) kicking his or her leg when the mobile is presented.