All governments exist in order to A. Give one person all political power B. Promote a specific religion C. Divide all well equally C. Make sure people follow the law

the answer is so the government makes sure people follow the law

Make sure people follow the law

By process of elimination, not all governments give one person all political power (i. e. the United States divides power between three branches), not all promote a specific religion (i. e. separation of church and state), and not all believe everything should be shared equally (i. e. any country that isn't rooted in socialism).