Which is a correct unit for expressing 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.     \({\text{mol}}\,{\text{s}}\)

D.     \({\text{mo}}{{\text{l}}^{ - 1}}\,{\text{d}}{{\text{m}}^{\text{3}}}{{\text{s}}^{ - 1}}\)

A