The central idea of the paragraph is that giving parents the ability to choose the schools their children attend creates more options for low-income families.
The text to which the question refers emphasizes how public policies should help parents have the power to choose the school to which they will send their children.
This is because if public policies allow children from lower social classes to study in private schools, everyone will benefit.
The above question is incomplete, as you did not show the text to which it refers. This text is in the attached image.
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