If Butter and Margarine Are Substitute Goods,an Increase in the Price

If butter and margarine are substitute goods,an increase in the price of butter is most likely to:

A) shift the demand curve for margarine rightward.
B) shift the demand curve for margarine leftward.
C) increase the quantity of margarine demanded.
D) decrease the quantity of margarine demanded.
E) decrease the price of margarine.