GDP mean gross domestic products so in simpler terms it means what you sell as a product, so if your GDP is high and you are economically stable your most likely a developed country that has a good economy ( so answer A )
Yes there are differences
Some delegates believed that guarantees of certain basic rights and liberties were missing from the Constitution. They called for amendments that would secure a wide range of liberties, such as religious freedom, freedom of speech and press, and protection against unreasonable searches and seizures.
Although the recommended amendments differed from state to state, most contained provisions that would limit the powers of the new national government and protect the people from inconsistent and oppressive rule.
-Hope this helped :)
