You have been called for a 3-year-old male patient who is "not breathing right." Aside from a notable expiratory wheeze, which of these findings would be a cause of great concern?

A) Respiratory rate of 24 breaths/min
B) Clinging to his mother and crying
C) Prolonged and forced expiration
D) Abdominal wall movement with inspiration

C) Prolonged and forced expiration