After a bronchoscopy, the RT notes that it is taking more ventilator pressure to ventilate the patient's lungs than before the procedure. This could be caused by which of the following?

1. Bronchospasm
2. Pneumothorax
3. Hypoxemia
4. Pulmonary hemorrhage

A. 1 and 2 only
B. 2 and 3 only
C. 1, 2, and 4 only
D. 2, 3, and 4 only