Answer:
C) Unaided recall
Step-by-step explanation:
This is an example of unaided recall because the researcher only asked Mark about which commercials he remembered. The researcher did not mention any specific commercial or asked him if he remembered something about a specific commercial (that would have been aided recall).
E.g. Unaided recall ⇒ Which commercials do you remember? Aided recall ⇒ What did you like about the Planters' commercials.