Answer:
2. Students are staying up late completing homework and not getting enough sleep.
Step-by-step explanation:
Number 1 is not the correct solution because that will not support the idea to convince the teacher to give less homework. That is a student's fault and bears nothing at all to the teacher and the amount of homework given.
Number 3 is a valid point, but it does not support the main objective. If students are not learning in school, the school needs to change, not less homework be given.
Number 2 is the correct piece of evidence because if students are staying up too late to complete the homework, that is affecting their health in a negative way. That is also something the teacher could adapt to and change. Thus, number 2 is the correct piece of evidence.