How Did Labor in the United States Change After Passage

How did labor in the United States change after passage of the first state child labor law in Massachusetts in 1836?

A) Child labor increased until the early 1900s when new federal laws were passed.
B) Child labor decreased because of laws that limited the number of hours children could work.
C) Child labor was eliminated so that children could attend school and adults could find jobs.
D) Child labor increased because children were cheap and less likely to strike because they were orphans.