According to john locke and the declaration of independence, the fundamental purpose of government is to

It is to preserve the people's natural rights.

Government is a context in which the rulers promise to safeguard the people's natural rights. If rulers betray their trust, the governed have the right to replace them.

Exposition : comprehensive description and explanation of a theoryso the one that best describe it would be : d. writing which explains information by using things such as definitions, compare - and - contrast, and cause-and-effect