Which of the Following Is the Best Example of Negative

Which of the following is the best example of negative reinforcement?

A) Chase's mom spanked him for hitting his little brother. Chase now hits his brother less frequently.
B) Jeremy's mom grounded him for not doing his homework. Now he rarely forgets to complete his assignments on time.
C) Abby's mother constantly told her to water the plants in the lawn. She eventually complied and did what her mother wanted her to so that her mother doesn't tell her the same thing again.
D) Chad's new teacher gives him a prize box toy for every five books that he reads. He now reads more frequently than he used to.