Ead the claim. the way to improve education is to divide schools by gender, so that males and females are taught separately. which sentence provides the best supporting evidence for the claim? a.) if students spend even 10% of their time being distracted by the opposite gender, then that is just silly. b.) my dad has been a teacher since 1993, and i think he does fine teaching in a school that has only male students. c.) at least 50% of my class is the opposite gender, and the amount of time they are distracted by the opposite sex is minimal. d.) a 1993 study showed that teachers tend to favor males over females, thereby creating an inequality in mixed-gender schools.

The claim is that dividing schools into male and female separate schools can improve education. 

So we are looking for evidence that says both of two points: (1) schools should be divided and (2) dividing the schools improves education.

We can go through the choices and eliminate the ones that don't say both points. You can see that A and C don't support that schools should be divided. They're saying that undivided schools shouldn't be a problem, so A and C are wrong. B talks about divided schools, but it doesn't say anything about how dividing schools improves the students' education, only that the dad is fine with teaching in separate schools, so B is wrong.

The only answer left that supports both points is:
D) A 1993 study showed that teachers tend to favor males over females, thereby creating an inequality in mixed-gender schools.