Final answer:
The most professional response when you don't know the answer to a customer's question is to admit it and seek help from a knowledgeable colleague while also trying to find information from reliable sources like product packaging.
Step-by-step explanation:
When a customer asks a question about a product and you do not know the answer, the best way to respond is A. Admit that you don't know the answer and take the customer to a coworker or supervisor who can help. This approach ensures that the customer receives accurate information and demonstrates professional integrity.
Additionally, it can be helpful to look for information on the product's packaging or on relevant signs as you involve a coworker or supervisor. Acknowledging a lack of knowledge but showing a willingness to find the correct answer can help maintain the customer's trust and reassure them that they are receiving reliable assistance.