You are treating a 5-year-old child who has had severe diarrhea and vomiting for 3 days and is now showing signs of shock. Supplemental oxygen has been given and you have elevated his lower extremities. En route to the hospital, you note that his work of breathing has increased. You should:

A: listen to the lungs with a stethoscope for abnormal breath sounds.
B: lower the extremities and reassess the child.
C: begin positive-pressure ventilations and reassess the child.
D: insert a nasopharyngeal airway and increase the oxygen flow.

Answer: B: lower the extremities and reassess the child.