A subject has her DLCOsb measured as 10.1 ml CO/min/mm Hg (STPD);her diffusing capacity measured by the DLCOrb is 9.1 ml CO/min/mm Hg (STPD).These findings are consistent with:
A) Normal lung function B) Normal difference in a subject with restriction C) An improperly calibrated He analyzer D) The inability to breath hold near TLC