Question

what to a slave is the fourth of july test
if there is a disparity between mias grades this year and her grades last year, which of the following must be true?
mias grades this year are better than they were last year.
mias grades this year are the same as they were last year.
mias grades this year are different than they were last year
mias grades this year are worse than they were last year

Explanation:

The word “disparity” means a difference or inequality. So if there is a disparity between Mia's grades this year and last year, it simply means her grades are different. It doesn't imply better or worse.

Answer:

Mia's grades this year are different than they were last year.