Answer:
The given statement describes the techniques of a pizza business and asks which technique they are using to attract old customers. Based on the options provided, the most appropriate answer is "differentiate their product."
Step-by-step explanation:
Out of the given options, "differentiate their product" is the most relevant technique used by the pizza business to attract old customers. By differentiating their product, the pizza business can stand out from its competitors and offer something unique that old customers will remember and appreciate. This can help the business to retain old customers and attract new ones who are interested in the unique offerings. The other options, such as "be the low-cost leader" or "focus on only one type of person," may attract new customers, but they do not necessarily focus on retaining old customers. Operating efficiently may help the business reduce costs, but it does not necessarily target old customers specifically.