Final answer:
If the price of gym classes, a complementary good to t-shirts, increases, Pam's quantity demanded of gym classes will decrease, but her demand for t-shirts will be unaffected. Option A
Step-by-step explanation:
If t-shirts and gym classes are considered complementary goods, then an increase in the price of gym classes will lead to a decrease in the quantity demanded of gym classes. This is because as the price of gym classes increases, people are less likely to purchase them, resulting in a decrease in demand.
As a result, Pam's quantity demanded of gym classes will decrease. However, the demand for t-shirts will be unaffected by the increase in the price of gym classes. The demand for t-shirts is determined by factors such as price, income, and preferences, which are not affected by the price of gym classes. Option A