Professor Yu has so many memories of former students that she has difficulty remembering the names of new students. The professor's difficulty BEST illustrates interference.

The answer is proactive interference.

Explanation:

Proactive interference is a type of memory encoding failure in which old memories interefere in creating new memories. Another example is trying to remember your new phone number after having a previous one for many years.

In contrast, retroactive interference may occur if new information makes it difficult to retrieve old information. That would happen if professor Yu couldn't remember his old students' names.

The French and Indian war. The territories changed.

Explanation: