In early civilization, the idea of mandates of heaven was used mainly to ?

The Mandate of Heaven concept helped individuals or groups of people gain power in a civilization.  An individual would claim that they had received a Mandate of Heaven which granted them divine recognition to rule.  By claiming their authority came from the gods, the people would accept them as their leader.

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they made rome the dominant power in the mediterranean.

the option which was not a function of missionaries in the northwest was the first one - they established posts for trading furs and other goods.

missionaries were sent around the world to spread religion and their knowledge and others - they were not merchants who sold furs and other goods.