Question

rifles, shotguns, and handguns differ mostly based on their: a barrels and ammunition b barrels and safeties c actions and stocks d actions and ammunition

Explanation:

Rifles have long barrels and use specific ammunition. Shotguns have smooth - bore barrels and use shot - type ammunition. Handguns have shorter barrels and use handgun - specific ammunition. The barrel type and the type of ammunition they use are key differentiators among these firearms.

Answer:

A. barrels and ammunition