The following relationship must hold between the average total cost (ATC) curve and the marginal cost curve (MC):

A、ifMCisrising,ATCmustberising.
B、ifMCisrising,ATCmustbegreaterthanM
C、
C、ifMCisrising,ATCmustbelessthanM
C、
D、ifATCisrising,MCmustbegreaterthanAT
C、