If the 15th unit of output has a marginal cost of $29.50 and the average cost of producing 14 units of output is $30.23, what will happen to the average cost of production if the 15th unit is produced?a. Average cost could increase or decrease depending on what happens to variable costb. Average cost will fallc. Average cost could increase or decrease depending on what happens to fixed costd. average cost increases as more is produced