To become a citizen of the united states, you must a. pass an english and government test. b. have lived in the united states for at least six months. c. file a request form in a federal court. d. be at least 21 years old.

The only realistic and accurate option here is B) have lived in the United States for at leat six months. This step should be done before filling the application form. The process by which somone becomes a foreign citizen of a country is called Naturalization.