Answer:
D. Teachers across the country assign hours of homework each night, but not only is it not always beneficial for students, it can also lead to high stress levels and burnout.
Step-by-step explanation:
This claim effectively introduces the topic of homework and its potential negative impacts on students, and sets the tone for the rest of the essay. It also clearly states the main argument of the essay, which is that homework is not always beneficial for students and can lead to stress and burnout.