You feel every citizen has the right to own a gun. if you argue for that right based on the constitution,
you're most likely to refer to
a. amendment ii.
b. amendment vi.
c. amendment iv.
d. amendment i.

If you feel that every citizen has the right to own a gun and you argue for this based upon the Constitution. You are most likely referring to the "right to bear arms" which is written in Amendment II of the Constitution or the Second Amendment. 

The common sense pamphlet i think