After Ariel Gave Birth to a Healthy Baby Boy,the Physician

After Ariel gave birth to a healthy baby boy,the physician immediately placed the baby next to Ariel's breast so the infant could begin breastfeeding.This practice

A) enables the baby's "let-down" reflex to occur,so his gastrointestinal tract will function normally.
B) increases the baby's heart rate,reducing his risk of myoendocarditis.
C) suppresses Ariel's metabolic rate,so her body can shift more energy into milk production.
D) stimulates Ariel's uterus to contract,reducing her risk of bleeding excessively.