In Using a Flowmeter to Measure the Volume of Air

In using a flowmeter to measure the volume of air in your lungs you determine that your vital capacity is 5 liters, your expiratory reserve is 1 liter, and your inspiratory reserve is 2.5 liters.This means that your total lung capacity is

A) 5 liters, because your vital capacity is a measure of your total lung capacity.
B) close to 6 liters, because your residual volume, which you did not measure, is most likely about 1 liter.
C) 7.5 liters, because your total lung capacity is equal to your vital capacity plus your inspiratory reserve.
D) 8.5 liters, because your total lung capacity is equal to your vital capacity plus your inspiratory reserve plus your expiratory reserve.
E) close to 9.5 liters, because your residual volume, which you did not measure, is most likely about 1 liter.