An individual with respiratory symptoms undergoes pulmonary function testing.The RV measured by helium dilution is increased but is lower than the RV measured by body plethysmography.Which of the following is the most likely explanation for this difference?

A)There is a problem with one of the machines.
B)The individual has severe air trapping.
C)The individual did not keep his mouth pressed tightly around the mouthpiece,and air leaked out during the helium dilution testing.
D)The individual held his breath during body plethysmography.
E)The individual has a loss of lung compliance.