Most of our information about the early aryans comes from the

A western tribe of ancient India records the account of invaders from the north that we know as Aryan babrarians.

d.

thist title points out that you are explaining the nature of the u.s. government. it is the most specific. a representative government consists of a government where decisions are taken according to a voting system. the most essential aspect of a representative government is found in the different structures where voting rights are granted to different groups of people. for example, voting for governor, mayor, president, local police chief etc.