The correct answer is A. National Labor Relations Act.
The National Labor Relations Act, passed in 1935, is a federal law that gave private sector employees significant rights in the work place. These rights include the ability to join a union without penalty, the ability to collectively bargain with their employers over wages, and the opportunity to take collective action (like striking) against their employers if the conditions/wages are not up to par. This was history in the making, as laborers had been fighting for legal rights like this since the late 19th century.
1. The British were ready to help the South fight the war if Robert E. Lee's invasion into Maryland (the Battle of Antietam) was successful.
2. Lincoln was afraid that, because Confederate territory was so close to Washington DC, the capital would be overrun by Confederate forces.
3. He wanted to preserve the Union, even if it meant keeping slavery
Sorry if this isn't very useful, I'm learning about the Civil War myself in school
Could be wrong but pretty sure it's D.