Which of the Following Is an Example of Negative Reinforcement

Multiple Choice

Which of the following is an example of negative reinforcement?

A) You clean your room because your mother promised you a chocolate bar if you do.
B) You clean your room because you can't stand hearing your mother nag at you anymore.
C) You clean your room because your mother said she's take your Playstation away if you didn't.
D) You clean your room because your mother said she'd smack your butt if you didn't.