AssumE thAt output inCrEAsED From 1550 to 1850 units pEr DAy As A rEsult oF inCrEAsing lABor From 200 to 210 workErs. thE mArginAl proDuCt oF lABor is ClosEst to:
A．

A. 1.55 units pEr DAy pEr workEr.

B．

B. 30 units pEr DAy pEr workEr.

C．

C. 1.25 units pEr DAy pEr workEr.