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(C) We use the formula $\frac{M_1 	imes D_1 	imes H_1}{W_1} = \frac{M_2 	imes D_2 	imes H_2}{W_2}$,where $M$ is the number of examiners,$D$ is the

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$10$

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(C) We use the formula $\frac{M_1 	imes D_1 	imes H_1}{W_1} = \frac{M_2 	imes D_2 	imes H_2}{W_2}$,where $M$ is the number of examiners,$D$ is the number of days,$H$ is the number of hours per day,and $W$ is the amount of work (number of answer papers).Given:$M_1 = 4, D_1 = 10, H_1 = 5, W_1 = 1$$M_2 = 2, D_2 = 20, H_2 = x, W_2 = 2$Substituting the values into the formula:$\frac{4 	imes 10 	imes 5}{1} = \frac{2 	imes 20 	imes x}{2}$Simplifying the equation:$200 = 20x$$x = \frac{200}{20} = 10 \, 	ext{hours per day}$.Thus,$2$ examiners would need to work $10 \, 	ext{hours}$ a day.

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