You Observe a Person in the Lab Trying to Recall

Multiple Choice

You observe a person in the lab trying to recall some information. He is not able to do so. The experimenter says that it is do to forgetting, but She is not sure if it is an effect of interference or the result of amnesia. Which of the following would help you to decide?

A) If recognition was used as well as recall
B) If the interference was retroactive
C) If the method of loci was used
D) If there was some kind of trauma
E) If the interference was proactive