Suppose that goods A and B are close substitutes. If the price of good A decreases, then we would expect :
a) increase in the demand for A and a decrease in the quantity of B demanded.
b) increase in the demand for A and an increase in the quantity of B demanded.
c) increase in the demand for good A as well as for good B.
d) increase in the quantity of A demanded and a decrease in the demand for B