To Support Nations trying to resist Soviet control.
The issue with democratic systems versus a republic or a constitutional monarchy, whereas there is a Magna Carta, or otherwise any guaranteed protection of the people's rights is that it can be voted away to a majority.
An unelected king that has total control over his subjects with no restraint of power or protection for the people will make none the difference but that in a democracy that person was elected to have total control over his subjects.
The disadvantage, or advantage, of a democracy, is that the majority will always rule over the minority. Regardless of there protected rights.
During the Constitutional Convention of 1789, there was a dispute regarding the representation of the states in Congress. The large states wanted the number of representatives in Congress to be proportional to that state's population. On the other hand, the smaller states wanted the number of representatives per state to be equal among all states.
The "Great Compromise" was a solution to this. It was a combined proposal of the Virginia Plan and the New Jersey Plan. It concluded that the House of Representatives (Lower House) should have a proportional representation according to the population of each state. Regarding the Senate (Upper House), The representation would be limited to 2 senators per state, regardless of the number of people living in each of them.
Personally, I would choose C because you could talk about the first time cars came out, when they were first used on the roads, and maybe relate to other countries (some came before, others after!) and who invented it-some background info on the inventor of the first car, etc.
:)