Which of these people is CLOSEST to becoming a US citizen?

Question

Which of these people is CLOSEST to becoming a US citizen?
A) Chris, an immigrant who served honorably in the US Navy during a war
B) Hector, who has been married to a lawful permanent resident for three years
C) Val, who has worked in the US for twenty years, but does not have a green card
D) Li, whose employer has applied for a special visa to allow her to work in the US

Answer 1

From the Internet:

 

Naturalization Through Military Service
If you are serving or have served in the U.S. armed forces and are interested in becoming a U.S. citizen, you may be eligible to apply for naturalization under special provisions of the Immigration and Nationality Act (INA).