Sanjay is writing a rebuttal to this counterclaim. Teachers should not assign a heavy homework load because many high school students have jobs and their share of household chores.

Which reason can Sanjay use to most effectively refute the counterclaim?

Even though students may work or help out at home, it is impossible to learn in today's overcrowded classrooms. People who say there should not be any homework need to be realistic and accept facts.
It is true that some students work and help out at home. However, there are many others who do not, and these students are even more likely to leave their homework undone.
I am a high school student who manages to work, take care of my little brother, and keep up with my homework, too. If I can do this, there is no reason others cannot do it, too.
It is true that students often work and do household chores, but managing homework in addition to other responsibilities helps students learn to organize their time efficiently and prioritize their studies.