Which of the Following Is Not Acceptable in the SI $\mathrm { N } \cdot \mathrm { cm } / \mathrm { s }$

Multiple Choice

Which of the following is not acceptable in the SI system of units?

A) $\mathrm { N } \cdot \mathrm { cm } / \mathrm { s }$
B) $\mathrm { kg } / \mathrm { L }$
C) $\mathrm { m } / \mathrm { ns }$
D) $\mathrm { J } / \mathrm { m } ^ { 2 }$