Final answer:
The best option for the sales associate to handle the call while taking a payment is a polite greeting followed by asking permission to put the caller on hold, thus demonstrating excellent customer service and respect.
Step-by-step explanation:
The best way for the sales associate to answer the phone would be option b: "Good afternoon. May I put you on hold?" This response is polite and acknowledges the caller with a greeting while also asking for their permission to wait. It balances prompt customer service with the necessity of managing multiple tasks at once, showing respect for both the in-store customer and the caller. This approach is in line with providing excellent customer service, maintaining a professional appearance, and showing commitment to the company's overall goal of serving customers efficiently.