Final answer:
The best solution for resolving conflicts over a child's sleeping habits is to observe the infant's cues, as per SIDS research recommendations.
Step-by-step explanation:
The best solution to Betty and Ming's conflict over their child's sleeping habits is to observe the infant's cues to determine sleeping preferences (Option C). This approach is supported by substantial research on sudden infant death syndrome (SIDS), which suggests that infants should be placed on their backs to sleep in cribs free of items that pose suffocation threats.
It is also essential for caregivers to ensure that the baby does not overheat and is in a smoke-free environment. Each family's situation is unique, so while seeking advice from friends, relatives, and professionals could provide guidance, careful observation of the infant's individual needs and preferences is crucial.