Which of the following is an example of negative reinforcement?

a. Leilani does well on her math test, so her mother takes her out for ice cream.
b. When Carter hits his baby brother, his father sends him to his room for timeout.
c. Tiffany did not eat her vegetables at dinner, so her parents took away her nightly TV privileges.
d. Owen wakes up faster in the morning now that his mother bought him a really annoying alarm clock.

Answer: D