a
Let mass related as \(M \propto \,{T^x}{C^y}{h^z}\)
\({M^1}{L^0}{T^0} = {\left( T \right)^x}{\left( {{L^1}{T^{ - 1}}} \right)^y}{\left( {{M^1}{L^2}{T^{ - 1}}} \right)^z}\)
\({M^1}{L^0}{T^0} = {M^z}{L^{y + 2z}} + {T^{x - y - z}}\)
\(z = 1\)
\(y + 2z = 0\) \(x - y - z = 0\)
\(y = - 2\) \(x + 2 - 1 = 0\)
\(M = \left[ {{T^{ - 1}}{C^{ - 2}}{h^1}} \right]\)