Final answer:
A militia according to the U.S. Code is composed of all able-bodied males between 17 and 45 who are citizens or intend to become citizens and female citizens in the National Guard.
Step-by-step explanation:
According to the United States Code, a "militia" includes two key groups: all able-bodied males at least 17 years of age and under 45 years of age who are citizens or have declared an intention to become citizens, and female citizens who are members of the National Guard. Therefore, the correct composition of a militia would be option 2: All able-bodied males at least 17 years of age and under 45 years of age who are, or who have made a declaration of intention to become citizens of the United States, and female citizens of the United States who are members of the National Guard.