As Tim Is Doing His Homework While on the Phone

As Tim is doing his homework while on the phone with his friend Sue, his pencil snaps and he gets up to get a new one in the basement, where his family keeps all the school supplies. When he gets down to the basement he forgets why he came down. What probably happened?

A) memory misattribution
B) absentmindedness
C) blocking
D) retrieval-induced forgetting