Which of the following provides an example of how the principle of checks and balances works?
A. The President selects a federal judge; the Senate has to approve the nomination.
B. The national court system spans the country, each of the 50 states has its own court system.
C. A Democrat occupies the White House: Republicans control the House and Senate.
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D. The government is not all-powerful; it can only do what the people give it the power to do.