The nurse cares for patients in a pediatric headache clinic. Which patient should the nurse assess first?

A) The 4-year-old child with abdominal pain and nausea.
B) The 10-year-old child vomiting in the examination room.
C) The 12-year-old child who reports smelling smoke and fire.
D) The 6-year-old who screams when someone touches the child's head.