A group of scenes form an "act" so the answer would be C.
Compulsory voting is an effect of laws which require eligible citizens to register and vote in elections, and may impose penalties on those who fail to do so. So, C. it is required by law.
What do you mean with 12 century leaders. Are you sure it says 12 century?
Politics also must balance security with individual liberty because many possible and actual safety measures involve restrictions on liberty.
