If you read each of these, or speak them, there is only one that suits the sentence correctly.
Go with the third one. Couldn't seems to fit pretty well there.
Active reading involves a process in which a person engages intellectually with the text. it requires focusing on the material by hightailing imp passages making notes in margin and regularly asking questions from your self related to the text. brain storming and etc.
I really personally dont think it should be taught in school at all, honestly I do not like history at all, due to what both men and women dealt with, from the unequal rights to the other horrible things that occurred. It seems like disrespectful to teach this due to it being some of their ancestors that were slaves at a time or any part of history in that matter. I think if a student wanted to learn about it then they should read about it in the libraires, or ask a teacher for tutoring on the subject, and not actually teach any students about this.
