Question ID:PT89 S2 Q4 Passage:Although smaller class sizes are popular with parents and teachers, the evidence shows that large scale reductions in class size lead to only slight improvements in student performance. Because school finances are limited, the cost-benefit test that any educational policy must pass is not "Does this policy have any positive effect?" but rather "Is there a more productive use of education dollars?" So public funds would in fact be better spent on efforts to recruit and retain better teachers. Stem:Which one of the following is an assumption required by the argument?  Correct Answer Choice:BChoice A:Reducing class size is an extremely expensive type of educational reform measure. Choice B:Dollar for dollar, efforts to recruit and retain good teachers yield larger improvements in student performance than do reductions in class size. Choice C:Because reducing class size is a popular policy, it is much easier to get public approval for that policy than for most other educational policies. Choice D:Reducing class size is the most cost effective way to recruit and retain good teachers. Choice E:In practice, it is difficult to identify what would be the most productive use of education dollars.