The dimensions of k in the equation W\[=\frac{1}{2}\,\,k{{x}^{2}}\] is

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