You have been called for a 1-week-old infant who is sick. Assessment reveals him to have a fever and rhonchi in the left lower lobe. Which of the following assessment findings would be most concerning to you, given the age of this patient?

A) Respiratory rate of 33 breaths per minute
B) Skin that is pink and warm
C) Continual moaning and crying
D) Nasal passages occluded by mucus

D