The Wheeler Wheat Farm sells wheat to a grain broker in Seattle, Washington. Since the market for wheat is generally considered to be competitive, the Wheeler Wheat Farm maximizes its profit by choosing

A、a.toproducethequantityatwhichaveragevariablecostisminimized.;
B、b.toproducethequantityatwhichaveragefixedcostisminimized.;
C、c.tosellitswheatatapricewheremarginalcostisequaltoaveragetotalcost.;
D、d.thequantityatwhichmarketpriceisequaltothefarm'smarginalcostofproduction.