Final answer:
The vital capacity of lungs for an average adult male ranges from 4 to 5 liters of air; therefore, the most accurate answer given the options is (b) 4 liters.
Step-by-step explanation:
The vital capacity of lungs is the total amount of air a person can exhale after a maximal inhalation. This capacity can vary depending on individual factors such as genetics, sex, and height. However, for an average adult male, the vital capacity is typically between 4000 and 5000 milliliters or 4 to 5 liters of air. Considering the choices provided in the question, the closest answer would be (b) 4 liters of air. It is vital to remember that while the total lung capacity is approximately 6 liters of air for an average male, the vital capacity does not include the residual volume of air that remains in the lungs after a forceful exhalation.