Answer:
The most effective claim for Chelsea's essay arguing that homework is bad for students is:
"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."
This claim effectively highlights the common practice of assigning homework, acknowledges that it may not always be beneficial, and identifies the potential negative consequences such as high stress levels and burnout. It presents a clear argument that can be supported and discussed in the essay.
Step-by-step explanation: