BAsED on thE ConCEpt oF Diminishing rEturns, As thE quAntity oF output inCrEAsEs, thE short-run mArginAl Costs oF proDuCtion EvEntuAlly:
A．

A. risE At A DECrEAsing rAtE.

B．

B. risE At An inCrEAsing rAtE.

C．

C. FAll At An inCrEAsing rAtE.