In the formation of phosgene from carbon monoxide and chlorine, which of the following is rate determining?

In the formation of phosgene from carbon monoxide and chlorine, which

1.	In the formation of phosgene from carbon monoxide and chlorine, which of the following is rate determining?
A.	Decomposition of chlorine
B.	Formation of COCl.
C.	Reaction of COCl. with Cl2
D.	Decomposition of CO2
Answer» D. Decomposition of CO2