Answer:
Proactive interference
Step-by-step explanation:
Proactive interference occurs when the past memories of an individual interfere with the ability to retain new memories. In other words, it is the interference effect of some that has been learnt previously on the ability to acquire or retrieve new information. An example is when an individual is memorizing a new list of information, and when trying to remember the later part of the list, the earlier part of the list interferes in retrieving the later part of the list.
Therefore, the difficulty Carlos have in remembering the new phone number after previously learning the old phone number is referred to as proactive interference