The Respiratory Therapist Is Listening to the Heart Sounds of a Patient

The respiratory therapist is listening to the heart sounds of a patient with a suspected pulmonary embolus. The therapist could expect to hear:
1) increased second heart sound (S₂) .
2) increased splitting of the second heart sound (S₂) .
3) third heart sound (S₃) .
4) fourth heart sound (S₄) .

A) 1
B) 2, 3
C) 2, 3, 4
D) 1, 2, 3