Final answer:
Baron de Montesquieu believed in the importance of separation of powers.
Step-by-step explanation:
The subject of this question is History. The question is asking about Baron de Montesquieu's beliefs. Baron de Montesquieu believed in the importance of d. separation of powers. He argued that the powers of government should be divided into distinct branches, such as the executive, legislative, and judicial, to prevent the abuse of power and protect political liberty.