When the price of a substitute of X commodity falls, the demand for X

The correct answer is: A. Rises

When the price of a substitute of X commodity falls, the demand for X will rise. This is because consumers will now be able to purchase the substitute at a lower price, which will make it more attractive to them. As a result, they will demand more of X.

Here is a brief explanation of each option:

• A. Rises. When the price of a substitute of X commodity falls, the demand for X will rise. This is because consumers will now be able to purchase the substitute at a lower price, which will make it more attractive to them. As a result, they will demand more of X.
• B. Falls. This is not the correct answer because the demand for X will rise when the price of a substitute of X commodity falls.
• C. Remains unchanged. This is also not the correct answer because the demand for X will rise when the price of a substitute of X commodity falls.
• D. Any of the above. This is not the correct answer because the demand for X will rise when the price of a substitute of X commodity falls.