The correct answer is C) Army
Explanation:
WAC, also known as the Women's Army Auxiliary Corps was an auxiliary unit and part of the United States Army.
It was modeled on the a similar British unit called the ATS and was seen as a good model to integrate women into the US army.
It was established in 1942 during the World War II but faced massive opposition among conservatives who believed it was immoral for women to serve in the Army alongside men.
By 1978, the WAC was completely dissolved and both male and female personnel began to work together.
It is indeed really interesting to learn that the Secret Services doesn't just look after the President and other important political figures, but it was also created to protect US currency, and it still does today! That is a deeply interesting and obscure historical fact that could be added to the introduction of the essay. The second option is the fittest.
It could be added that the Secret Service is a United States federal law enforcement agency under the United States Department of Homeland Security. And that one of its main functions is the protection of the President, Vice-President and their families; former members of the federal government; besides candidates for presidential elections; foreign heads of state visiting the country; and embassies.
It could be added tahta President Lincoln created the Secret Service to investigate and prevent the practice of counterfeiting.