The hunter-gatherer birth spacing interval is primarily the result of:​

A) ​high infant mortality rate
B) ​nutritional stress
C) ​contraceptive practices
D) ​breastfeeding and child-rearing techniques

Hunter-gatherer birth spacing interval is primarily the result of breastfeeding and child-rearing techniques. Hunter-gatherer mothers breastfeed their babies frequently and for extended periods, which suppresses ovulation and decreases the possibility of another pregnancy. Additionally, child-rearing practices specific to hunter-gatherer societies, such as communal child care and infant-carrying techniques, allow mothers to space out pregnancies and recover from the physical demands of childbirth. Nutritional stress and contraceptive practices play a role, but they are secondary factors. High infant mortality rates may also contribute, but they are not the primary reason.