A Container Having a Volume of 1

A container having a volume of 1.0 m³ holds 5.0 moles of helium gas at 50°C. If the helium behaves like an ideal gas, the average kinetic energy per molecule is

A) 6.7 × 10⁻²⁰ J.
B) 1.0 × 10⁻²¹ J.
C) 1.0 × 10⁻²⁰ J.
D) 6.7 × 10⁻²¹ J.
E) 1.3 × 10⁻²⁰ J.