What type of background check is required for purchasing a firearm from a licensed dealer in Louisiana?

In Louisiana, a federal background check is required for all firearm purchases from a licensed dealer. This is because federal law requires all licensed dealers to conduct a National Instant Criminal Background Check System (NICS) check before selling a firearm. Option A is incorrect because federal law mandates all licensed dealers to conduct a background check. Option B is incorrect because even though some states have their own background check system, Louisiana follows federal law. Option D is incorrect because only a federal background check is required in Louisiana, not a state one. Therefore, the correct answer is C.