Nitrogen Dioxide Decomposes to Nitric Oxide and Oxygen Via the Reaction

Nitrogen dioxide decomposes to nitric oxide and oxygen via the reaction:
2NO₂ → 2NO + O₂
In a particular experiment at 300°C, [NO₂] drops from 0.0100 to 0.00650 M in 100 s. The rate of appearance of O₂ for this period is _ M/s.

A) 7.0 × 10^{- 5}
B) 3.5 × 10^{- 3}
C) 7.0 × 10^{- 3}
D) 3.5 × 10^{- 5}
E) 1.8 × 10^{- 5}