For the Reaction 4 NH₃(g)+ 7 O₂(g) $\to$ 4 NO₂(g)+ 6 H₂(g),if H₂ Is Produced at a Rate

For the reaction 4 NH₃(g) + 7 O₂(g) $\to$ 4 NO₂(g) + 6 H₂(g) ,if H₂ is produced at a rate of 3.5 $\times$ 10^-3 M/s, O₂ is consumed at a rate of __________

A) 2.5 $\times$ 10^-2 M/s.
B) 2.1 $\times$ 10^-2 M/s.
C) 4.1 $\times$ 10^-3 M/s.
D) 3.0 $\times$ 10^-3 M/s.
E) 5.8 $\times$ 10^-4 M/s.