Answer:
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level.
Elements: Argon
A. Sugar... Because the others are mixes of things and combinations. Sugar is pure and on its own.
I hope this helps!
Explanation:
I think B a chemical change