Which of These Statements Correctly Describes Functional Residual Capacity

Multiple Choice

Which of these statements correctly describes functional residual capacity?

A) It is the extra volume of air that can be actively expired.
B) It is the minimum volume of air remaining in the lungs even after a maximal expiration.
C) It is the volume of air in the lungs at the end of a normal passive respiration.
D) It is the volume of air entering or leaving the lungs during a single breath.