Which of these factors contributes to infants’ and children’s increased risk for upper airway…

Which of these factors contributes to infants’ and
children’s increased risk for upper airway obstruction as compared with adults?

a. Underdeveloped cricoid cartilage and narrow nasal
passages b. Small tonsils and narrow nasal passages c. Cylinder-shaped larynx
and underdeveloped sinuses d. Underdeveloped cricoid cartilage and smaller
tongue