The r.m.s velocity of $CO_2$ at a temperature $T$ (in kelvin) is $x\; cm\;sec^{-1}$. At what temperature (in kelvin), the r.m.s. velocity of nitrous oxide would be $4x\;cm\;sec^{-1}$ ? <br> (Atomic weights of $C, \; N$ and $O$ are respectively $12, \; 14$ and $16$) :

Question

( A ) 32 T
( B ) 2 T
( C ) 16 T
( D ) 4 T