How do we know Frederick was an enlightened ruler who believed in reason and the spread of knowledge?

Explanation:

Enlightened despots held that royal power emanated not from divine right but from a social contract whereby a despot was entrusted with the power to govern in lieu of any other governments. ... An essay defending the system of enlightened despotism was penned by Frederick the Great, who ruled Prussia from 1740 to 1786.

b)

it created free trade throughout the colonial territories.

the answer you are looking for is letter c. he supported the idea of a un-run war in serbia to bring peace to the area.

supporting this idea was an important step that bill clinton took in order to attempt to secure bosnia and keep the peace there. he led peace reconciliations -known as the dayton agreement- leaving bosnia as a single state made up of two parts with one central government.