Right option is (c) 2735.43 m/s
The explanation: The formula of root mean square speed is given by urms = \(\sqrt{3RT/M}\). We have R = 8.314 kgm^2/s^2, M = 10^-3 kg/mol and T = 300 k. So by substituting the formula we get, urms = \(\sqrt{3×8.314×300/10^{-3}}\) = 2735.43 m/s.