Other Things Constant, Which of These Is Likely to Increase

Multiple Choice

Other things constant, which of these is likely to increase the supply of vanilla ice cream?

A) an increase in the price of vanilla beans, an ingredient in ice cream
B) a decrease in the sales tax on ice cream
C) an increase in the price of chocolate ice cream
D) a decrease in the price of milk, an ingredient in ice cream
E) an increase in the price of hot fudge