I believe that the answer is D.
After world war 1, and before world war 2 Roosevelt wanted to join the league of nations. The USA never did join and Roosevelt was not the first President to want to join the league of nations. Roosevelt after world war 2 founded the United Nations, of which the USA is still a member today.
The answer is A
“It can nullify an unconstitutional law, which means that Americans will no longer have to follow it.”
The primary difference between Presidential and Congressional Reconstruction plans was that the presidential plan was far more progressive, while many in Congress wanted to punish the South.