Which of the following statements about marginal benefit are? true? 1. To describe preferences commaTo describe preferences, economists use the concepteconomists use the concept of marginal benefit.of marginal benefit. nothing nothing 2. The marginal benefit ofThe marginal benefit of a good or service is thea good or service is the benefit received frombenefit received from consuming one more unitconsuming one more unit of it.of it. 3. To describe preferences commaTo describe preferences, economists use the concepteconomists use the concept of marginal cost.of marginal cost. nothing nothing 4. We calculate marginalWe calculate marginal nbsp benefit of the slope of the benefit of the slope of the PPF .PPF. nothing nothing Question content area bottom Part 1 A. Statements 1 and 21 and 2 are correct. B. Statements 3 and 43 and 4 are correct. C. Statements 1 and 31 and 3 are correct. D. Statements 2 and 42 and 4 are correct.