Final answer:
An employee should act professionally and respectfully when discussing how a customer looks in a dress. They should provide constructive feedback if asked and focus on the positive aspects of the customer's appearance.
Step-by-step explanation:
An employee should act professionally and respectfully when discussing how a customer looks in a dress. It is not appropriate to offer personal opinions on how it looks (option a) as it can be subjective and may make the customer uncomfortable. Instead, the employee should provide constructive feedback if asked (option b). They can offer suggestions on how to enhance the customer's appearance or provide guidance on finding a better fit. The employee should also focus on the positive aspects of the customer's appearance and offer assistance as needed (option c). They can compliment the customer on what looks good and provide helpful advice, such as suggesting accessories or alterations that can further enhance the dress.