单选题 The law of diminishing returns states that for a given production process, as more and more of a resource (such as labor) are added, holding the quantities of other resources fixed:

A. cost declines at an increasing rate.
B. cost declines at a decreasing rate.
C. output increases at a decreasing rate.

【正确答案】 C

【答案解析】The law of diminishing returns states that for a given production process, as more and more resources (such as labor) are added holding the quantities of other resources fixed, output in creases at a decreasing rate. This occurs because, at some point, adding more workers results in inefficiencies.