Final answer:
The most frequent causes of death for children under five in low-income countries are pneumonia, diarrhea, congenital anomalies, preterm birth complications, birth asphyxia/trauma, and malaria.
Step-by-step explanation:
The question is about the most frequent cause of death for children under five in low-income countries. According to the World Health Organization, the most frequent causes of death in low-income countries are pneumonia, diarrhea, congenital anomalies, preterm birth complications, birth asphyxia/trauma, and malaria. These causes of death can be prevented or treated with affordable interventions including immunization, adequate nutrition, safe water and food, and quality care by a trained health provider when needed.