At STP, consider the three separate 1.0-L samples of He, O₂, and Cl₂ behaving ideally. Rank them in order of increasing average kinetic energy and increasing average velocity.

• A. Cl₂ < O₂ < He; Cl₂ < O₂ < He
• B. He < O₂ < Cl₂; He < O₂ < Cl₂
• C. He < O₂ < Cl₂; All gases will have the same average volecity
• D. All gases will have the same kinetic energy; Cl₂ < O₂ < He
• E. All gases will have the same kinetic energy; He < O₂ < Cl₂
• F. All gases will have the same kinetic energy and the same average velocity.