The dimensional formula for Boltzmann's constant is? [MP PET 2002; Pb. PET 2001]

• A.             \[[M{{L}^{2}}{{T}^{-2}}{{\theta }^{-1}}]\]
• B.               \[[M{{L}^{2}}{{T}^{-2}}]\]
• C.             \[[M{{L}^{0}}{{T}^{-2}}{{\theta }^{-1}}]\]
• D.               \[[M{{L}^{-2}}{{T}^{-1}}{{\theta }^{-1}}]\]