If the domestic and foreign prices of a particular product remain the same, but the foreign currency appreciates against the domestic currency, what happens to the relative price of the domestic product?

a. The relative price of the domestic product increases, making the domestic product more expensive.

b. The relative price of the domestic product decreases, making the domestic product more price competitive.

c. The relative price of the domestic product increases, making the foreign product more price competitive.

d. The relative price of the domestic product decreases, making the domestic product more expensive.