Which statement best describes the conclusions of expert, Eric Hanushek?

Question

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Eric Hanushek's conclusion is that studies of class size and pupil-teacher ratios provide little empirical evidence to support policies aimed at expanding these resources. He argues that increases in funding should be used to improve teacher quality and other inputs that have been more strongly correlated with student achievement, rather than simply reducing class size or lowering pupil-teacher ratios.

Which Statement Best Describes the Conclusions of Expert, Eric Hanushek