I'd say the answer is C because that doesn't really narrow down what he is trying to write about. he needs a more complex question for research.
The correct answer is C because we know that layers of government is a characteristic of a form of government and so is A and B so the best answer is C. it never talks about socialization through education in no form of government.
Answer:
"which became popular in the 1960s"
Explanation:
"which became popular in the 1960s" is the answer because is starts with 'which'
The correct answer is yet