The correct answer for the question that is being presented above is this one: "(d) expansion that will end when the price of the product is equal to its marginal cost."
Here are the following choices: (a) contraction that will end when the price of the product is greater than its marginal cost (b) contraction that will end when the price of the product is equal to its marginal cost (c) expansion that will end when the price of the product is greater than its marginal cost (d) expansion that will end when the price of the product is equal to its marginal cost