Assume the XYZ Corporation is producing 20 units of output. It is selling this output in a purely competitive market at $10 per unit. Its total fixed costs are $100 and its average variable cost is $4 at 20 units of output. This corporation_______

a. shouldclose down in the short run.
b. is maximizing its profits.
c. is realizing a loss of $60.
d. is realizing an economic profit of $40.