Answer: A 
O80 is the appropriate code here as it specifies a full-term, uncomplicated and normal delivery. 
Option B is not correct O82 codes for cesarean delivery without indication, which is not seen in this case. 
Option C is not correct because Z37.2 is used to specify Twins, both liveborn, but here, the female gave birth to a single child. 
Option D is not correct because Z37.3 is used to specify Twins, one liveborn and one stillborn, but here, the female gave birth to a single child who is healthy and alive.