Holding all factors constant except one and increasing a variable factor is expected to lead to steadily decreased marginal product of that factor, this is an example of ?

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Holding all factors constant except one and increasing a variable factor is expected to lead to steadily decreased marginal product of that factor, this is an example of ?

A. decreasing returns to scale
B. The law of diminishing returns
C. constant returns to scale
D. an inefficient production technique