A firm sells 1000 units per week. It charges $15 per unit, the average variable costs are $10, and the average costs are $25. In the short-run, the firm should:

a. Shut-down as the firm is making a loss of $10,000 per week
b. Shut-down as price is lower than average cost
c. Continue operating as the firm is covering all the variable costs and some of the fixed costs
d. Shut-down because it is cost effective to pay off the remaining fixed costs