Use the Following to Answer Question(s)

Use the following to answer question(s) :
Exhibit: Total Revenue, Total Cost, and Economic Profit

-(Exhibit: Total Revenue, Total Costs, and Economic Profit) Which of the following is (are) true?

A) Total revenue and total cost are equal at approximately 8,300 pounds of output.
B) Marginal cost and marginal revenue are equal at approximately 8,300 pounds of output.
C) At approximately 4,500 pounds of output, marginal cost is zero and increasing returns sets in.
D) All of the above are true.