Answer:
C. interference
Step-by-step explanation:
Interference theory: In psychology, the term interference theory describes that forgetting of a particular memory occurs because different memories interfere with each other and therefore disrupts or distorts one another. In other words, forgetting occurs due to the interference of one memory with that of another.
There could be two possible way of memory interference including proactive interference and retroactive interference.
In the question above, Zachary's memory difficulty most clearly illustrates the interference theory of forgetting.