Among Its Other Purposes,how Is the Valsalva Maneuver Used

Among its other purposes,how is the Valsalva maneuver used?

A) To aid in defecation and urination
B) As part of the procedure for giving CPR to a person in respiratory arrest
C) To ventilate the lungs during eupnea
D) To expel more than the usual tidal volume from the lungs
E) To clear carbon monoxide from the body and replace it with oxygen