Not too sure maybe choice C?
In 1936, Landon sought the Republican presidential nomination opposing the re-election of Roosevelt. ... Landon proved to be an ineffective campaigner who rarely traveled. Most of the attacks on Roosevelt and Social Security were developed by Republican campaigners rather than Landon himself.
It is B, George Washington.
Well the South remember seceded completely, meaning they weren't part of the United States at all. Reconstruction allowed them back in, along with help from the 10% plan. The plan allowed the states and their governments back in as long as 10% of the population swore allegiance to the Union.