Which of the Following Statements Is Correct

Which of the following statements is correct?

A) When the marginal cost curve is above the average cost curve, the average cost curve must be rising.
B) When the marginal cost curve is below the average cost curve, the average cost curve must be rising.
C) When MR = MC, the average cost curve is at its minimum point.
D) When MR = P, the average cost curve is at its minimum point.