The correct answer are:
Civics; it is crucial as to to understand the relations with the public, the way of communication with the people, the way they think, what's important for them.
Government; it is the basics for knowing the place of work and how it is functioning, its purposes, its construction, its core.
History; always important as to know what happened in the past, so that improvements can be made, mistakes avoided, and great ideas to be implemented.
Economics; as in every sector, so in here too, economics is the basics for functioning, so the knowledge of it and to know how to function and prosper in the economic waters is one of the most important, if not the most important of all.