在完全竞争市场上，厂商处于长期均衡时（ ）。
（A）P=LMC=LAC=SMC=TCP = LMC = LAC = SMC = TCP=LMC=LAC=SMC=TC
（B）P=LMC=LAC=SMC=SACP = LMC = LAC = SMC = SACP=LMC=LAC=SMC=SAC
（C）MR=AR=MC=ACMR = AR = MC = ACMR=AR=MC=AC
（D）MR=LMC=SMC=LAC=SACMR = LMC = SMC = LAC = SACMR=LMC=SMC=LAC=SAC
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