Answer:
Since you have to choose two answers, I feel it would be safe to use " A student’s choice of clothing is protected by the First Amendment of the US Constitution, since dress is a form of expression," and "One recent study found that school uniforms had no effect on behavioral issues, but they had a negative effect on academic performance."
Explanation:
These two seem to be much more important facts than the rest. For the first statement, the Constitution is something important to the American people. Pulling a card like that is a highly strong argument since it's illegal to go against the Consitution.
For the second statement, schools depend on their students, though it may sound harsh, to improve how they look. If the students do well, then so does the school because they are recommended more than others. If the students are doing a horrible job, it reflects badly on the administrators' teaching skills and no one really wants that to happen. So, if clothing choice were to affect academic performance, the schools would want to fix that, no?