Final answer:
The most appropriate greeting for a busy medical office is to provide a warm welcome, identify the office, and introduce oneself, as in option A: "Good morning. This is Dr. Bewell's office. Ms. Blakely speaking."
Step-by-step explanation:
When handling incoming calls in an extremely busy medical office, the recommended greeting is option A: "Good morning. This is Dr. Bewell's office. Ms. Blakely speaking." This greeting is professional, informative, and personal. It provides a warm welcome with "Good morning," identifies the office, and introduces the person speaking. This level of detail in the greeting aids in establishing a connection with the caller and demonstrates a high level of professionalism, which can be particularly reassuring in a healthcare setting.