Discussion
The function of primer is :
Answer: B
The function of the primer is to ignite the main charge.
When the firing pin strikes the cap, the small charge of sensitive primer compound (lead styphnate, barium nitrate and antimony sulphide in many modern primers) explodes and sends a flash through the flash hole into the propellant, setting it burning. The primer is also the source of the lead, barium and antimony particles in gunshot residue.
It is the propellant that drives the bullet, not the primer. Lubrication is provided by bullet coatings or grease, and corrosion protection by the cartridge case and non-corrosive priming compounds; neither is the primer's function.
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