When 1 carbon atom combines with 2 oxygen atoms, the resulting substance is called a(n)

Carbon Dioxide

Explanation:

This bond of sharing, one electron is called, a covalent bond. Carbon combines with Oxygen, to form Carbon dioxide. One atom of Carbon combines, with two atoms of Oxygen, to form C O 2. One Carbon atom shares, two electrons, with each Oxygen atom.

supercell thunderstorms are perhaps the most violent of all thunderstorm types, and are capable of producing damaging winds, large hail, and weak-to-violent tornadoes

i think the answer is b.