Which of the following is true of one party government
a) all other political parties are forbidden by law
b) citizen do not have freedom of speech
c) a single person controls the government
d) all of the above

The correct answer is the letter A, here an explanation:

The one-party system is a partisan system of authoritarian regimes in which a single political party is legal, confused with the state itself, and legally no other party can exist. Sometimes the term one-party rule is used to describe a dominant party system in which there are other parties, but the laws prevent the opposition from legally gaining power.

answer; by working independently, the states have a high likelihood of developing innovative solutions that can be employed in other states;