Ms. sacco's u. s. history students perceive her to be incompetent. they also think that she is unfair and that she does not care about her students. according to recent research, ms. sacco's students are likely to

I believe the answer is: Cheat in her classes.

People who already perceived themselves as 'incapable' to do something, tend to be more likely to make less effort in doing that activity.
This less effort would lead to a self-serving bias that caused them to be actually fail in doing it. (just like how the students are treated in the class)