Barbara has just moved into a new apartment and has memorized her new phone number. now she finds that she cannot recall the phone number from her old apartment. she has

Retroactive interference

Explanation:

In psychology, there are some processes that can interfere in our long term memory. One of them is the retroactive interference.

Retroactive interference refers to when you have some difficulties remembering a task you learned before because you now learned a new task. In other words, this new learning interferes with your old memories and the old memories are disrupted.  

In this example, Barbara has memorized her new phone number, she has learned something new but this new learning is interfering with her old memories (her old phone number). Therefore this would be an example of retroactive interference.

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