Which of the following sentences from the introduction [paragraphs 1-6] BEST develops a central idea of the article? (A) And at least four 2020 presidential candidates have come up with elaborate plans to raise teachers' pay by thousands of dollars. (B) Politicians were convinced, they told the public, that school districts had too much money and just needed to find a way to spend it more effectively and more efficiently. (C) Now, in light of the teacher strikes, there's an aggressive push by politicians in some states to undo tax cuts in order to improve school districts' budgets and teachers' pay. (D) "There's only so much political capacity states have to raise revenue," said Rebecca Sibilia, who leads advocacy group EdBuild.