15.Scenario: Doreen's Dairy produces and sells Swiss cheese. Last year, it produced 7,000 pounds and sold each pound for $6. In producing the 7,000 pounds, the dairy incurred variable costs of $28,000 and a total cost of $40,000. Refer to Scenario. In producing the 7,000 pounds of cheese, the firm's average variable cost was
(A)$1.71.
(B)$4.00.
(C)$5.71.
(D)$6.00.