Propaganda is certainly A lie, but B. is not correct as propaganda's Main purpose wasn't Just that, Propaganda is a form of spreading false facts and statements to get a population to believen false and fictional beliefs and ideoligies. We could take it back to 1933 when Adolf Hitler became Chancellor of Germany (Pre-WW2), He had a propaganda Minister Joseph Goebbels who's main job was to manipulate and deceive Germany into believing Nazi Ideology. Many Cruel Regimes and Empires have used this as a way to deceive their population, Most of the time,sadly,it can be successful.
Propaganda is made to further the agenda of a person. It often has incorrect or misleading information in order to influence the audience it was made for. One common example of propaganda in political propaganda, this makes bold claims to make people vote for a certain candidate.
C. Representation in Congress and also direct taxes on the population of the states.
The 3/5 compromise determined how slaves would be counted in deterring a states population. This would directly affect the house of representatives (which is counted by population) and taxes that are based on population.
The fourteenth amendment was critically important for civil liberties because it helped start the process of selective incorporation of the Bill of Rights.