Carefully Examine the Following Reaction Sequence for the Catalytic Formation

Carefully examine the following reaction sequence for the catalytic formation of ozone, O₃, from molecular oxygen, O₂. Which chemical compound is behaving as the catalyst? O₂ + 2 NO → 2 NO₂
2 NO₂ → 2 NO + 2 O
2 O + 2 O₂ → 2 O₃

A) nitrogen monoxide, NO
B) nitrogen dioxide, NO₂
C) oxygen, O₂
D) atomic oxygen, O