Which of the Following Is an Example of Proactive Interference

Multiple Choice

Which of the following is an example of proactive interference?

A) You read your watch,someone interrupts you and asks for directions,and now you can't remember what time it is.
B) The court requires that you testify against your brother,but you love your brother and suddenly can't remember the details of the incident.
C) You cannot remember the new phone number that the phone company assigned you last week.
D) You keep calling your new boyfriend your old boyfriend's name.