Part A:
The clauses incorporated into the Constitution serve primarily to prevent one branch of the government from becoming too powerful (Option C). They establish checks and balances among the legislative, executive, and judicial branches. For instance, the requirement for a bill to be approved by both houses of Congress and then signed by the President (or overridden by a two-thirds majority in Congress) ensures that no single entity can unilaterally create laws. Similarly, the treaty-making power of the President requires the advice and consent of the Senate, and the impeachment powers of the House establish a mechanism to hold officials accountable.
Part B:
The additional detail from the Constitution that is MOST directly associated with the answer to Part A is:
B. "The Congress shall have Power . . . To make all Laws which shall be necessary and proper for carrying into Execution the foregoing Powers, and all other Powers vested by this Constitution in the Government of the United States, or in any Department or Officer thereof."
This clause underscores the principle of checks and balances by delineating the powers of Congress while implying that these powers must be executed within the framework set by the Constitution, thereby preventing concentration of power within any one branch.