b
The maximum speed at which the cyclist will not skid is,
$v_{m}=\sqrt{\mu r g}=\sqrt{0.2 \times 3 \times 10}=2.45 m / s$
$=\frac{2.45 \times 60 \times 60}{1000} km / h =8.82 km \cdot h^{-1}$
Among the given options $7.2\; km \cdot h^{-1}$ is less than this.