To communicate that students are motivated by grades, which of these sentences is least ambiguous? only teachers say that grades motivate students. teachers only say that grades motivate students. teachers say only that grades motivate students. teachers say that only grades motivate students.

Teachers say that only grades motivate students.

Explanation:

This is the best option, because it states that the only thing that motivates students are grades, and it is said by the teachers, who are responsible for the motivation and the grades of the students, they are together on a daily basis, so they must know something about what motivates them.

"Teachers say... it states a common belief among teachers... than only grades, and this is the students only motivation."

i think it could possibly be b

the civil rights act was passed on april 9, 1866 by a republican dominated congress. it was passed over president johnson's veto, in an effort to push back against discrimination of african americans.