Suppose That a Community Health Center Finds That, Regardless of the Number

Suppose that a community health center finds that, regardless of the number of physicians or nurse practitioners employed, it can always replace one family practice physician by using two additional nurse practitioners without affecting the quantity or quality of patient office visits. This finding implies that:

A) physicians and nurse practitioners are perfect substitutes in production.
B) physicians and nurse practitioners are perfect complements in production.
C) diminishing returns will occur as the health center hires more nurse practitioners.
D) the marginal product of physicians will increase by two with every nurse practitioner hired.