Consider the US Market for Chocolate,a Market in Which the Government

Consider the US market for chocolate,a market in which the government has imposed a price ceiling.Which of the following events could convert the price ceiling from a nonbinding to a binding price ceiling?

A) ​a government study that shows that consuming chocolate increases the incidence of cancer.
B) ​a large increase in the size of the cocoa bean crop;cocoa beans are used to produce chocolate.
C) ​South American cocoa bean producers refuse to ship to chocolate producers in the US.
D) ​a sharp drop in consumer income;chocolate is a normal good.