The ratio of root mean square speed to average speed to most probable speed for an ideal gas at a given temperature is

1. A$\sqrt{3}:\sqrt{8/\pi }:\sqrt{2}$
2. B$\sqrt{2}:\sqrt{8/\pi }:\sqrt{3}$
3. C$\sqrt{3}:\sqrt{2}:\sqrt{8/\pi }$
4. D$1:1:1$