french political thinker baron de montesquieu (1689–1755) was one of the enlightenment's most important thinkers. he is famous for saying that "when the [law making] and [law enforcement] powers are united in the same there can be no liberty."
to which principle of government is montesquieu's statement most directly related?
a) bill of rights
b) individual rights
c) popular sovereignty
d) separation of powers