Project A has an expected rate of return of $5\%$ and a coefficient of variation of $\mathrm{.}1.$ Project B has an expected rate of return of $15\%$ and a coefficient of variation of $\mathrm{.}2.$ Project $C$ has an expected rate of return of $20\%$ and a coefficient of variation of $\mathrm{.}15.$ Which project possesses the greatest amount of risk?