Suppose You Are Feeling a Positive Emotion Such as "Relief

Suppose you are feeling a positive emotion such as "relief" (e.g., you thought your wallet had been stolen but realized it wasn't) or "joy" (e.g., you just heard that your older sister had a baby) . Would it be possible for that emotion to be converted into another emotion via excitation transfer?

A) No, once a full-blown emotion has "registered," it cannot be converted into another emotion.
B) Yes, although typically (once a positive emotion has already been "registered") it can only be converted into another positive emotion.
C) Yes, although typically (once a positive emotion has already been "registered") it can only be converted into a negative emotion.
D) Yes, it can be converted into another positive emotion or (just as easily) into a negative emotion.