An annular disc has a mass $m$, inner radius $R$ and outer radius $2R$. The disc rolls on a flat surface without slipping. If the velocity of the center of mass is $v$, the kinetic energy of the disc is
- $\dfrac{9}{16}mv^2 \\$
- $\dfrac{11}{16}mv^2 \\$
- $\dfrac{13}{16}mv^2 \\$
- $\dfrac{15}{16}mv^2$