At What Kelvin Temperature Does the Rms Speed of the Oxygen

Multiple Choice

At what Kelvin temperature does the rms speed of the oxygen (O₂) molecules in the air near the surface of the earth become equal to the escape speed from the earth? (R = 8.31 J/mol · K; molar mass of O₂ gas is 32 g/mol; radius of the earth R_E = 6.37 $\times$ 10⁶ m; the escape speed from the earth is 11.2 km/s)

A) 4.8 $\times$ 10⁵ K
B) 8.0 $\times$ 10⁴ K
C) 1.6 $\times$ 10⁵ K
D) 1.1 $\times$ 10⁴ K
E) 3.6 $\times$ 10⁵ K