Which of These Techniques Would Work Best to Change a Behavior

Which of these techniques would work best to change a behavior?

A) Li's parents yelled at her for getting poor grades in her final exam.
B) Raj's mother slapped him on the hand for taking a cookie from the cookie jar.
C) Lori's parents sent her to her room after she threw mashed potatoes at her brother.
D) Jose's parents bought him a new toy truck for being nicer to his little sister.