When the temperature is near $0\,\text{K}$, the specific heat capacity of a certain solid is described by $c = bT^3$, where $T$ denotes temperature and $b$ is a constant specific to the solid. The SI unit of specific heat capacity is $\text{J kg}^{-1}\text{K}^{-1}$. In SI base units, what is the unit of the constant $b$?
- A$\text{m}^2\text{s}^{-2}\text{K}^{-3}$
- B$\text{m}^2\text{s}^{-2}\text{K}^{-4}$
- C$\text{kg m}^2\text{s}^{-2}\text{K}^{-3}$
- D$\text{kg m}^2\text{s}^{-2}\text{K}^{-4}$