The law of diminishing returns states that at some point:（）
A. as less of a resource are devoted to production, holding the quantity of other inputs constant, the output will decrease, but at an increasing rate.
B. as more of a resource is devoted to production, holding the quantity of other inputs constant, the output will increase, but at a decreasing rate.
C. as more of a resource is devoted to production, holding the quantity of other inputs constant, at some point output will begin to decrease.