An Aqueous Solution Contains 0

An aqueous solution contains 0.050 M of methylamine. The concentration of hydroxide ion in this solution is _ M. K_b for methylamine is 4.4 × 10^{- 4}.

A) 0.050
B) 4.7 × 10^{- 3}
C) 2.2 × 10^{- 5}
D) - 4.9 × 10^{- 3}
E) 4.5 × 10^{- 3}