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Q4. The Salem Board of Education wants to evaluate the efficiency of the town's four elementary schools. The three outputs of these schools are: (1) average reading score, (2) average mathematics score, and (3) average self-esteem score. The three inputs to these schools are: (1) average educational level of mothers (defined by highest grade completed: 12 = high school graduate, 16 = college graduate, and so on), (2) number of parent visits to school (per child), and (3) teacher-to-student ratio. The relevant information for the four schools is given in the table below. School Input 1 Input 2 Input 3 Output 1 Output 1 Output 3 A 14.5 0.25 3.5 2.7 3 13 0.13 3.3 2.5 2.4 15.5 0.28 3.8 3 3.3 16.2 3 0.33 4 3.8 3 B 2 4 3 3 4 Which of the following statement(s) is(are) true? A) If we assume constant returns to scale, school A is efficient B) If we assume constant returns to scale, school D is not effcient. C) If we assume non-constant returns to scale, school A is efficient D) If we assume non-constant returns to scale, school C is efficient. E) None of the above