Final answer:
The formation of the first cabinet by President George Washington is an example of the unwritten constitution, as it established precedents not explicitly outlined in the Constitution itself.
Step-by-step explanation:
An example of the unwritten constitution is the formation of the first cabinet by President George Washington. This action was an early instance of establishing precedents that were not specifically outlined in the Constitution. The cabinet system helped President Washington administer his duties and has become an integral part of the executive branch, although it was not explicitly described in the Constitution at the time. Over the years, such practices have solidified into the unwritten constitution, which consists of political customs and traditions that influence the function of the government beyond the written text of the Constitution.
The action that is an example of the unwritten constitution is A) formation of the first cabinet by President George Washington.
This action expanded the power of the presidency by establishing a cabinet or group of advisors to assist the president in administering their duties. Although not specifically mentioned in the Constitution, the formation of a cabinet has become a longstanding tradition that continues to this day.