My Niece Has Terrible Temper Tantrums in the Grocery Store

Multiple Choice

My niece has terrible temper tantrums in the grocery store, so my sister is trying to think of a way to reduce the tantrums. Which of the following would be most likely to reduce the tantrums?

A) providing candy as a bribe in response to the tantrum
B) promising to punish her as soon as they got home
C) spanking her in the middle of the store
D) stopping any reinforcement by treats or attention until the tantrum ceased