You Are Listening to a Song on the Radio While

You are listening to a song on the radio while doing your homework. The phone rings. Your mother has called to tell you that your favorite uncle has died after being hit by a car. Three months later, you again hear the same song and suddenly feel very sad. In this example, the unconditional response is

A) the voice of your mother as she relays the bad news.
B) listening to the song.
C) your feeling about the song prior to the phone call.
D) your feeling about your uncle before he died.
E) feeling sad when your mother calls with the bad news.