Which are appropriate units for the rate of a reaction?

A.     ${\text{mol}}\,{\text{d}}{{\text{m}}^{ - 3}}{{\text{s}}^{ - 1}}$

B.     ${\text{mol}}\,{\text{d}}{{\text{m}}^{ - 3}}{\text{s}}$

C.     ${\text{mol}}\,{\text{d}}{{\text{m}}^{ - 3}}$

D.     s

A