The Gas Phase Reaction of Nitrogen Dioxide and Carbon Monoxide

The gas phase reaction of nitrogen dioxide and carbon monoxide was found by experiment to be second-order with respect to NO₂, and zeroth-order with respect to CO below 25°C. NO₂ + CO  NO + CO₂
Which one of the following mechanisms is consistent with the observed reaction order?

A) NO₂ + 2CO N + 2CO₂ fast N + NO₂  2NO slow
B) NO₂ + 2CO  N + 2CO₂ slow N + NO₂  2NO fast
C) NO₂ + NO₂  NO₃ + NO fast NO₃ + CO  NO₂ + CO₂ slow
D) NO₂ + NO₂  NO₃ + NO slow NO₃ + CO  NO₂ + CO₂ fast