Final answer:
Observational learning, also known as imitation or modeling, is the power illustrated in the scenario where Rebecca's baby girl, Grace, tries to make silly faces back to her mother after observing her doing so.
Step-by-step explanation:
Observational learning, also known as imitation or modeling, is the power illustrated in the scenario where Rebecca's baby girl, Grace, tries to make silly faces back to her mother after observing her doing so. In observational learning, individuals learn by watching others and imitating their behavior.