Answer:
Correct answer is A. The military defense of the colonies .
Explanation:
A is the correct answer as after the French and Indian War authorities believed that more soldiers should be located in the colonies, and that is why they introduced many acts, such as Stamp Act, Quartering act...
B is not correct as slavery didn't affect the security of colonies.
C is not correct as industry wasn't the reason for the increase of soldiers.
D is not correct as there were no religious conflicts.