How is convection used in tornadoes

so i tried so hard to find an answer but most of my google is blocked sooo : )

answer:

atmospheric convection is the result of a parcel-environment instability, or temperature difference layer in the atmosphere. moist convection leads to thunderstorm development, which is often responsible for severe weather throughout the world. special threats from thunderstorms include hail, downbursts, and tornadoes.

explanation:

answer; ///i do believe that the correct answer is (b); ///particle composed of two or more atoms bonded together;