Final answer:
The priority is to first treat the infant's injuries, then report observations and suspicions to a supervisor, with potential notification of law enforcement afterwards in line with medical facility protocols. Therefore, the correct answer is option c.
Step-by-step explanation:
When caring for an infant with a possible broken arm and ribs, and the parent's explanation for the injuries seems questionable, the priority is to treat the infant's injuries. Immediate medical care is essential to address the infant's symptoms and potential fractures, ensuring appropriate pain management and stabilization of the injuries.
Afterwards, it is important to report your observations and suspicions to your supervisor, as healthcare professionals are mandated reporters who must report any signs of abuse or neglect, including questionable explanations for a child's injuries. Notifying local law enforcement may be the next step, but this sometimes occurs after consultation with your supervisor or following the protocol of your medical facility.