If one zero of the quadratic polynomial $\mathrm{kx}^{2}+3 \mathrm{x}+\mathrm{k}$ is 2 , then the value of $\mathrm{k}$ is (a) $\frac{5}{6}$ (b) $\frac{-5}{6}$ (c) $\frac{6}{5}$ (d) $\frac{-6}{5}$