Answer:
The correct answer is B. demand for good X will increase.
Explanation:
Two goods, X and Y, are said to be substitutes if they can be used to serve the same purpose. Thus, if good X is a substitute to good Y, then X can be used in place of Y and Y can be used in place of X.
For substitute goods, the cross-price elasticity of demand is positive. This means that if the price of one good rises, the demand for the substitute good increases.
