The correct answer is B) The president vetoes a law passed by Congress, but Congress overrides the veto with a two thirds majority vote.
This shows how different branches of the government can check each others power. In this scenario, the president checks the power of Congress by not signing their bill into law. However, Congress (the legislative branch) checks the power of the president (the executive branch) by overriding this veto with a vote. This type of check on power ensures that no one person or group becomes too powerful in American society.