Martin purchased three units of good A. The marginal benefit of the fourth unit of A exceeds the marginal cost of the fo

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Martin purchased three units of good A. The marginal benefit ofthe fourth unit of A exceeds the marginal cost of the fourth unitof good A. Which of the following reasons explains why Martinshould purchase the fourth unit? I. The marginal net benefit of thefourth unit is positive. II. Buying the fourth unit will increasetotal benefits by more than total costs. III. Buying the fourthunit will increase total benefits and decrease total costs. A. Ionly B. I and II only C. II only D. I, II, III QUESTION 25 (4Marks) . Which one of the following statements is in