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3. Which of the following statements about investments in education is false? A. Implicit costs include what the student could have done by working. B. Comparison of the costs and benefits requires discounting to present value. C. The external benefits of schooling are real, but difficult to measure. D. Social rates of return ignore the costs paid by the government. 4. Why might investments in educating girls be especially attractive in poor countries? A. Females spend more years in the workforce than men. B. Females generate external benefits (raise healthier children). C. Females with more education have lower fertility rates. D. Both B and C