Historiography refers to the study of how historians build out their histories in a particular time period. This might include a study of how a historian from a particular time period utilizes primary and secondary sources and how they work original interviews into their work.
The answer to your question is B. separation of powers
:D
Gold and silver we're two benefits but they really wanted more territory control.
Voltaire's strongest belief was his belief in free will, the power of empirical science and a separation of church and state.