What is the recommended way to transport a firearm in a vehicle?

The recommended way to transport a firearm in a vehicle is to have it unloaded and placed in a locked case. This ensures that the firearm is securely stored and not easily accessible, thus reducing the risk of accidents or unauthorized use.

Option A is not safe as it suggests having the firearm loaded, which can pose a significant danger, especially while the vehicle is in motion. Option C is also unsafe because having an assembled firearm on the passenger seat is both a safety hazard and potentially illegal in some states. Option D is not suitable because storing ammunition in the glove compartment without a proper case for the firearm can increase the risk of accidents or theft.

Therefore, option B is the correct answer as it promotes safe and responsible firearm transportation practices.