This quote would most likely come out of a textbook that could be related to people who would support social darwinism. For that reason 3. Social Darwinism is the correct answer.
Social Darwinism talks exactly about this type of things where people and whole nations are in the struggle for survival and only the fittest ones will survive in this ongoing struggle.
Prospective voting is a theory of democratic elections where the voters choose what the government will do in the future by choosing a political party with clear stances on issues.
Look it up ok , but I think THE ANSWER IS A