Nitrous Oxide (N₂O)decomposes at 600°C According to the Balanced Equation $\rarr$

Nitrous oxide (N₂O) decomposes at 600°C according to the balanced equation 2N₂O(g) $\rarr$ 2N₂(g) + O₂(g)
A reaction mechanism involving three steps is shown below.Identify all of the catalysts in the following mechanism.
Cl₂(g) $\rarr$ 2Cl(g)
N₂O(g) + Cl(g) $\rarr$ N₂(g) + ClO(g) (occurs twice)
ClO(g) + ClO(g) $\rarr$ Cl₂(g) + O₂(g)

A) Cl
B) Cl₂
C) ClO
D) N₂O
E) ClO and Cl