If you're a manufacturer, and you want to showcase your product in a store that has a narrow but deep selection of merchandise and where sales associates can assist customers with their selections, you'd likely choose

a. an extreme value retailer.

b. a specialty store.

c. a department store.

d. a category specialist.

e. a warehouse club.

b. a specialty store.

Explanation:

A specialty store. -

It is a type of retail business, which focus on certain goods and services, is known as a speciality store.

These type of company are expert in making a certain goods or services.

For example,

The store that are designed specifically for men clothing or women clothing or specific for toys, cosmetics etc.

Hence, from the question, the correct term according to the given information of the question is a specialty store.