Compulsory School Attendance Laws were passed, what were they?

The correct answer to this open question is the following.

Although there are no options attached we can say the following.

It is true that Compulsory School Attendance Laws were passed. They were attendance laws for children to attend school in all the states of the Union. They started to be promulgated in 1852 and ended approximately in 1918. These laws required that all children in the United States attend private or public schools. It had the purpose of taking out children from the work in the factories to focus on school. Some states defined a specif age for the students to attend schools and a period of time they had to be in school.

the answer is b. 300t + 3/2xt