The best descriptions of the framework for the Constitution from your provided options are:
- A system of checks and balances is designed to prevent abuse of power.
- The separation of powers ensures that no one branch has too much power.
The other options regarding the four branches and powers belonging to the federal government are not accurate in the context of the U.S. Constitution. The Constitution establishes three branches of government—legislative, executive, and judicial—and powers not enumerated are generally assumed to belong to the states, not the federal government.