Questions: Demand for a product is most likely to increase because: A. consumers expect the future price to decline. B. the total number of consumers in a market declines. C. the product becomes unfashionable for consumers. D. demand for complementary goods rises.

The answer is D. demand for complementary goods rises.

If consumers expect the future price of a product to decline, they are likely to delay their purchases, leading to a decrease in current demand rather than an increase.

A decline in the total number of consumers in a market would typically lead to a decrease in demand, not an increase, as there are fewer people to purchase the product.

If a product becomes unfashionable, it is likely to see a decrease in demand because consumers are less interested in purchasing it.

When the demand for complementary goods rises, it often leads to an increase in demand for the related product. For example, if the demand for printers increases, the demand for ink cartridges (a complementary good) is also likely to rise.