The correct option is D. four years.
The amount of time the president and vice president serve in office together for one term is four years.
As we take a look on the constitution of USA we found that Article Two of the United States Constitution establishes the executive branch of the federal government, which carries out and enforces federal laws.
Article Two vests the power of the executive branch in the office of the president of the United States, lays out the procedures for electing and removing the president, and establishes the president's powers and responsibilities.
Hence the president and vice president serve in office together for 4 years.
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