Calf Tenderness and Dyspnea

35 year old woman with calf tenderness and acute dyspnea. The arterial blood gas reveals an O2 of 76 mm hg.
Which of the following is the most common finding in PE?

A)Wheezing
B)Increased second heart sound
c)Tachypnea
d)calf swelling
e)Pulmonary rales

ANSWER C