Final answer:
The correct action for the pharmacist is to review Mrs. Arthur's medication profile, monitor for interactions, and consult with healthcare providers, while maintaining patient confidentiality.
Step-by-step explanation:
When it comes to ensuring the safety and well-being of Mrs. Arthur, a long-standing patient with an extensive medication profile, option b is the most appropriate action for a pharmacist. Pharmacists must regularly review patients' medication profiles, monitor for drug interactions, and consult with healthcare providers as needed.
This is due to the crucial role pharmacists play in advising both physicians and patients about the selection, dosage, interactions, and side effects of drugs. As healthcare professionals, it's essential to maintain patient confidentiality, hence sharing medication profiles with others or contacting patients unsolicited is not compliant with professional standards.