C) populism
For future reference: an easy way to remember the causes is to use the acronym MAIN (as in the MAIN causes) to remember that they are militarism, alliances, imperialism, and nationalism.
Hope this helps :)
Answer: A.no time limit for the ratification process.
Explanation:
For the ratification process, the Congress will pass a proposed amendment which is by a two-thirds majority vote in the Senate and House of Representatives. This will then be sent to the states for ratification.
It should be noted that the framers of the Constitution set no time limit for the ratification process. Therefore, the correct option is A.