C. Christian, Germanic, and Roman
A political machine is a political organization in which an authoritative boss or small group commands the support of a corps of supporters and businesses (usually campaign workers), who receive rewards for their efforts. The machine's power is based on the ability of the workers to get out the vote for their candidates on election day.
Mercenaries were groups of people that pretty much had no loyalty to a single nation. The fought along with nations that paid them (roman empire in this case).