"TO WHAT expedient, then, shall we finally resort, for maintaining in practice the necessary partition of power among the several departments, as laid down in the Constitution? The only answer that can be given is, that as all these exterior provisions are found to be inadequate, the defect must be supplied, by so contriving the interior structure of the government as that its several constituent parts may, by their mutual relations, be the means of keeping each other in their proper places." Use the passage to answer the question. What is the main purpose of this excerpt from The Federalist No. 51, and which of the following best illustrates it? A. to outline the powers of the executive branch; the president signs a treaty B. to outline the powers of the legislative branch; Congress changes the date of an election C. to outline the system of checks and balances among the three branches; the Supreme Court declares a law unconstitutional D. to outline the system of checks and balances among the three branches; the president announces that he will run for a third term

D. to outline the system of checks and balances among the three branches; the president announces that he will run for a third term

This excerpt from The Federalist No. 51 suggests that the main purpose is to explain the importance of maintaining a separation of powers and checks and balances within the government. The idea is that each branch of government should have mechanisms in place to prevent any one branch from becoming too powerful and infringing on the powers of the others. The scenario provided in option D best illustrates this concept, as a president announcing that he will run for a third term would directly challenge the constitutional limits on presidential power and would likely be met with pushback from the other branches.