Final answer:
The risk of maternal mortality during childbirth is highest in Afghanistan due to factors such as high infant and child mortality rates, poverty, and limited access to prenatal and postnatal care.
Step-by-step explanation:
The risk of maternal mortality during childbirth is highest in Afghanistan. According to the given information, Afghanistan has significantly higher fertility and mortality rates compared to the other countries mentioned. The country's high infant and child mortality rates, along with factors such as poverty and limited access to prenatal and postnatal care, contribute to the elevated risk of maternal mortality during childbirth.