Answer: B. 8 to 14 years old.
Step-by-step explanation:
According to a Quiz|et on "Unit 10 History," the answer is B. Also, according to Goog|e, "By 1900, 31 states had compulsory school attendance for students from ages 8-14. By 1920, all the states required students aged 8 to 14 to attend school."
I hope this helps!