econ problems I need you help

Question 8 4 points Save Ansv An efficiency expert is hired to examine production in a plant producing engines for automobiles in which labor is the only variable input. The firm measures output per unit of labor input and finds it to be at the maximum possible level for the plant. It follows that O A. the marginal product of labor is at a maximum. O B. the plant has not yet reached the point of diminishing marginal returns. O C. the marginal product of labor is equal to the average product of labor. O D. the plant is operating at the maximum possible level of production.Question 9 If the price elasticity of supply of crude oil in Russia is zero, then a 20 percent increase in the price of crude oil will O A. result in a 20 percent increase in the quantity of Russian crude oil supplied. O B. have no effect on the quantity of Russian crude oil supplied. O C. increase the quantity of Russian crude oil supplied by more than 20 percent. O D. result in a 20 percent decrease in the quantity of Russian crude oil supplied