Susan Has Been Using the New Computer Operating System for Over

Multiple Choice

Susan has been using the new computer operating system for over six months. A friend who has an older version of the operating system calls Susan for help, since Susan used this older system for five years before getting the new one. As soon as Susan starts typing on her friend's computer, she realizes that she cannot remember specific details regarding this older operating system. Her inability to remember this older system is most likely due to

A) memory decay.
B) suppression.
C) retroactive interference.
D) proactive interference.