Valerie Used to Leave Her Room Really Messy and Not

Valerie used to leave her room really messy and not make her bed.A month ago, her parents got tired of cleaning up after her and cut off Valerie's allowance until she stopped leaving her room in such a mess.Now, Valerie almost always has her room clean before she leaves the house.Based on what is known about operant conditioning, you should conclude that for Valerie, losing her allowance acted as a:

A) positive punisher for leaving her room messy
B) negative reinforcer for leaving her room messy
C) conditioned stimulus for leaving her room messy
D) negative punisher for leaving her room messy