Final answer:
Specialty stores are the type of stores that focus on deep narrow assortments with a high level of customer service.
Step-by-step explanation:
The segment focusing on deep narrow assortments with a high level of customer service is characteristic of specialty stores. Specialty stores typically offer a narrow range of products within a specific category, such as clothing, electronics, or books. These stores aim to provide an exceptional customer experience by offering specialized knowledge and high-quality products.