The underground railroad and Abolitionist strategy
African-American slaves believed that they should be given land that they worked on so that they could be free and have their own land and make their own produce. This is why Sherman made the promise of 40 acres and a mule, however, they didn't get it. All of the land was given back to the previous owners of the land and the African-Americans were given wages for their work.
It would be D because during the civil war Maryland was a border state between the confederacy and Union. Maryland was also a slave holder state which meant it could secede easily. It would also make it vulnerable to the union if it seceded but both ways too.
Doctors Without Borders is just that. Doctors travel where the greatest need is. A great example is all the doctors traveling to New York to assist with Coronavirus. They may travel to countries with little or no resources so they have to use what they have. If you have ever watched the show MacGyver the lead character would make whatever he needed out of whatever was in the room he was in. These doctors have to think out of the box. Usually the doctors travel to third world countries where medical care is not readily available.