Correct Answer: Option D

Explanation

marginal product is calculated as the change in the total number of units produced divided by the change in a single variable input. 

change in the total number of units = 425 - 212 = 213

Change in single variable unit = 5 - 4 =  1 

The marginal product of the 5th unit of capital = \(\frac{213}{1}\) = 213

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