Answer
Choice A.
Work Step by Step
To use the ideal gas law, we must measure the temperature, pressure, and volume relative to a true zero point. This is stated on page 370.
Choice B is tempting, but keep in mind that changing the volume units only affects the value of the ideal gas constant.
Using gauge pressure, or measuring the temperature in Celsius degrees, would be a big mistake, as these methods measure P and T relative to an arbitrary fixed point.
