The correct answers are C) check and balances and E) separation of powers.
The concepts that best relate to the ideas of Baron de Montesquieu are the check and balances and separation of powers.
Baron de Montesquieu (1689-1755) was a great French writer and social philosopher of the Enlightenment that wrote "The Spirit of the Laws." In his book, he describes his idea of separation of powers, based on the Romans. He considered necessary a clear division of powers of the government in a judicial, legislative and executive branch, that could be controlled by a "check and balance system" in order to avoid any imbalance in the exercise of power.