Which best describes a historian's job?

to tell people what to think
to study the way in which landforms have changed
to come up with theories about the past
to disprove current interpretations of past events

Option C.

Explanation:

To come up with theories about the past, is the right answer.

A person who studies and records details about the past is known as a historian. He has authority over it. Historians are regarded with the constant, systematic account and analysis of past incidents as associating with the human race; as well as the investigation of all history in time.  Therefore, the main task of a historian is to come up with theories about the past.

he risk-return relationship. generally, the higher the potential return of an investment, the higher the risk. there is no guarantee that you will actually get a higher return by accepting more risk. diversification enables you to reduce the risk of your portfolio without sacrificing potential returns.

explanation:

c. free trade can lead to low pay for workers in poorer countries.