within a firearm, a burning material creates pressure to force the bullet or shot out of the barrel. what is…

within a firearm, a burning material creates pressure to force the bullet or shot out of the barrel. what is this burning material?\na primer\nb firing pin\nc wad\nd powder
Answer
Brief Explanations:
The primer ignites the powder. The firing - pin strikes the primer. The wad is a separator. Gunpowder burns rapidly to create the pressure that forces the bullet or shot out of the barrel.
Answer:
D. powder