Preterm infants are at greatest risk for.

Rationale: A. While perinatal mortality is higher in preterm infants compared with term infants, it is a consequence rather than a direct risk factor. B. Asphyxia can occur in both term and preterm infants and is not specific to prematurity. C. Cardiovascular complications may arise but are only one aspect of the broader risks associated with prematurity. D. Prematurity-related complications encompass the full spectrum of health risks preterm infants face, including respiratory distress syndrome, intraventricular hemorrhage, thermoregulation difficulties, feeding intolerance, and infection susceptibility. These complications are directly related to the immaturity of organ systems in infants born before 37 weeks’ gestation, making them the most comprehensive risk category.