b) residual volumeresidual volume is the amount of air that always resides w/in the lungs and functions to prevent lung collapseNOT A- b//c tidal volume is the amount of air inhaled and exhaled during normal breathing(a component of vital capacity)NOT C- b/c vital capacity is the total volume of air that can be exchanged throughout inhalation and exhalation(GREAT CHART ON P225)