If Goods a and B Are Considered Substitutes, a Decrease

If goods A and B are considered substitutes, a decrease in the price of A would cause

A) the demand curve for B to the right.
B) the demand curve for B to the left.
C) cause a movement along the demand curve for B to a (higher price, lower quantity) point.
D) cause a movement along the demand curve for B to a (lower price, higher quantity) point.