What Will Be the Units of the Rate Constant, K $\rightarrow$

What will be the units of the rate constant, k, for the following reaction?
2 NO(g) + 2 H₂(g) $\rightarrow$ N₂(g) + 2 H₂O(g)   rate = k (NO) ²(H₂)

A) s ^{- 1}
B) M/s
C) M ^{- 1} s ^{- 1}
D) M ^{- 2} s ^{- 1}
E) M² s ^{- 1}