The author will know that his argument was successful if more
schools extend the day with enriching experiences and test scores improve.
schools hire better teachers and use better curriculums.
teachers share ideas and plan their lessons together.
parents demand that students have more time for relaxation outside of school.
The author will know that his argument was successful if more schools extend the day with enriching experiences and test scores improve.
Explanation: This option directly links the argument for extending the school day with a measurable outcome (improved test scores). If schools implement longer days filled with enriching activities and those students perform better academically, it serves as evidence that the argument for extended school days is valid and effective.