[单选题]
In order to double thd+8np)ezeqi7p-f in,8wo( bs e average speed of the rgn3c t.5p(ai molecules in a given sample of gas, the temperat.n 3t r5(pacgiure (measured in Kelvin) must
A. quadruple.
B. double.
C. increase by a factor of square root two of its original value.
D. increase by a factor of square root three of its original value.
