The correct answer is that the Coal Mines act prohibited all the children under the age of ten from working underground in Coal Mines.
The Coal Mines Act of 1842 was passed by the United Kingdom Parliament. This act was an acknowledgement to the “Children's employment commission report of 1842” ( which described the horrific condition of the labors). the method of Coal extraction was outdated, hence the workforce including men, women and children, labored in hard conditions. Therefore the parliament of the United Kingdom banned the children under the age of ten, and also to women to go underground in the coal mines to work.