Explanation:

When a bullet is fired from a gun, the chemical potential energy stored in the gunpowder is rapidly converted into other forms of energy. The primary conversion for the bullet's motion is into kinetic energy. The expanding gases from the burning gunpowder exert force on the bullet, accelerating it down the barrel, thereby imparting significant kinetic energy to it. Some of the chemical energy is also converted into heat (due to friction and the hot gases), sound energy, and kinetic energy of the gun (recoil). While kinetic energy is a component of mechanical energy, the most direct and significant conversion for the bullet's motion is specifically kinetic energy. Option C (Heat energy) and Option D (Chemical energy) are incorrect because heat is a byproduct, and chemical energy is the initial form, not the conversion product for the bullet's motion. Option B (Mechanical energy) is too broad; kinetic energy is the specific form of mechanical energy the bullet gains.