Answer:
The paragraph in which the author identifies a source of debate is the following: "... being necessary to the security of a free state"
Step-by-step explanation:
This phrase points to the heart of the main reason behind this amendment; a state should provide security to its citizens by the means of giving each private citizen the right to bear arms. This point is debatable, since providing security does not necessarily imply that each citizen should bear arms, since this could possibly lead to a feeling of insecurity amongst each citizen. Since the statement above is questionable, it is a source of debate.