This would be Majority Leader.
Hope this helps!
<3
Thomas Jefferson's idea of how slavery could be tolerated in a nation that trumpeted liberty had to do with the fact that he felt it was a "necessary evil" that must continue long enough for the US to develop properly. He felt as though blacks were inherently inferior and therefore needed "guidance".
Im pretty sure the answer is,
C: Child workers were not allowed to work at the mills causing families to split
and
E: Factory workers faced dangerous or even deadly working conditions.
Really hope this helps:)