The answer is: A
The Second Amendment states the right of an individual to own a firearm as well as the right to form a regulated militia.
As such, we can deduct that the purpose of the amendment was made to not only protect an individual's right to own a firearm, but in case of an unjust regime, be able to fight against it through the use of said firearms.
Restricting a citizen's right to own a firearm, will in turn decrease the ability of citizens to stand up against an unjust regime.