Answer:
Proactive Interference.
Explanation:
In psychology, the term interference is used to refer to the phenomenon of forgetting in a long term memory. Forgetting of memories occurs due to the interference of memories with each other.
Proactive interference, thus, refers to the phenomenon of forgetting new memories because of old stored memory. The word 'pro' means 'forward', so the interference occurs when there's interference from the old memory to the new memory. The old tasks that have been learned interferes with the learning of new tasks.
In the given case, Shalissa, who learned French and History, was unable to retrieve the memory of History as she studied French first and there was interference from the old task to the new task. That's why all she remembered was French.
So, the correct answer is proactive interference.