Match Column I (Physical Variables) with Column II (Expressions) and select the correct answer using the codes given below ( $=n$ number of gas molecules present per unit volume, $k=$ Boltzmann constant,$T=$ absolute temperature, $m=$mass of the particle) :

	Column - I		Column - I
A)	Most probable velocity	p)	$nkT$
B)	Energy per degree of freedom	q)	$\sqrt{\left(3kT/m\right)}$
C)	Pressure	r)	$\sqrt{\left(2kT/m\right)}$
D)	R.M.S. velocity	s)	$kT/2$