If a Firm Is Producing a Given Level of Output

Multiple Choice

If a firm is producing a given level of output in an economically efficient manner,then it must be the case that

A) this is the lowest cost method of producing that output.
B) each input is producing its maximum marginal product.
C) this output level is the most that can be produced with the given level of inputs.
D) both a and c
E) none of the above