Final answer:
Emily is in the presentation stage of the selling process, explaining the benefits and features of the Guardian Shield security system to address customer concerns.
Step-by-step explanation:
Emily, a salesperson, is at the presentation stage of the selling process. In this phase, she is actively engaging with the customer by highlighting the features of her company's security system, Guardian Shield. The presentation stage involves responding to the customer's concerns by showcasing how the product can meet their needs, and in this case, how Guardian Shield offers comprehensive protection for everyday security needs, differentiating it from previous home security systems the customer may have encountered.