Explain the reason gases apply pressure.

• A. Gases apply pressure due to their randomly moving particles colliding with their container's walls.
• B. Gases apply pressure due to their parallel moving particles passing through their container's walls.
• C. Gases apply pressure due to their parallel moving particles colliding with their container's walls.
• D. Gases apply pressure due to their randomly moving particles passing through their container's walls.

Answer: (A)