Which of the following statement is/are true?

$\frac{C_{rms}}{C_{av}}=\sqrt{\frac{3\pi }{8}}$  as no T term is involved their ratio is independent of temperature  $K=\frac{3}{2}KT$ (On increasing temperature average kinetic energy also increases hence statement (B) is wrong)
On increase in temperature magnitude wise difference between rms and most probable speed will increase.
Speed depends upon M as  $\alpha \frac{1}{\sqrt{M}}$ So on increasing molar mass of gas speed decreases.