We would like you to assess the QUALITY of each of the following argument (discussing Gun Control) and determine if the argument is Valid or Invalid. A valid argument is clearly interpretable and either expresses an argument, or a premise or a conclusion that can be used in an argument for the topic of gun control. An invalid argument is a phrase that cannot be interpreted as an argument or not on the topic of gun control.

[Q]: Gun prohibitionists argue that the Second Amendment confers a right to bear arms only on duly enrolled members of a state militia.
[A]: Valid


[Q]: Indeed, the right to keep and bear arms���which we have explained pre-existed, and therefore was preserved by, the Second Amendment���was subject to restrictions at common law.
[A]: Valid


[Q]: There is no reason law-abiding citizens need to defend themselves as they are untrained, do not have full knowledge of the law and eventually cause more harm than good by owning such weapons.
[A]:
Valid