Which of the following correctly describes how Charles' law can be derived from the ideal gas law?

• A. By keeping pressure and temperature constant, the ideal gas law reduces to Charles' law.
• B. By keeping volume and moles constant, the ideal gas law reduces to Charles' law.
• C. By keeping temperature and moles constant, the ideal gas law reduces to Charles' law.
• D. By keeping pressure and moles constant, the ideal gas law reduces to Charles' law.

Answer: (D)