Refer to the information provided in Figure 7.4 below to answer the question(s) that follow. 
Figure 7.4Refer to Figure 7.4. The marginal product of the third worker is
A. 10.
B. 28.67.
C. 32.
D. 42.
Answer: A
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What is new about environmental problems today is
A. that for the first time in history, we have environmental problems. B. the increased rate at which air and water pollution is occurring in the United States. C. the amount of attention the community now gives them. D. that environmental problems with pollution and garbage disposal have almost completely disappeared.
A risk-averse investor compared to a risk-neutral investor would:
A. require a higher risk premium for the same investment as a risk-neutral investor. B. place less focus on expected return than the risk-neutral investor. C. place more focus on expected return and less on return than the risk-neutral investor. D. offer the same price for an investment as the risk-neutral investor.
All modern economies depend on
A. the exploitation of workers. B. government ownership of the means of production. C. free-enterprise. D. specialization.
What is the difference between the short run and the long run?
Please provide the best answer for the statement.