Which of the Following Is the Primary Difference Between Realism

Which of the following is the primary difference between realism and neorealism?

A) Realists focus on the selfish nature of individuals whereas neorealists believe human beings are naturally cooperative.
B) Neorealists believe that international anarchy, not the selfish nature of individuals, is responsible for the competitive nature between states.
C) Realists focus on national security issues whereas neorealists focus on economic matters.
D) Neorealists believe that states are naturally cooperative whereas realists believe that states are naturally competitive.
E) Realists believe that national security issues are paramount whereas neorealists believe that social issues such as the environment and poverty should be at the forefront.