Step 1: Read the clue in the sentence:
The blank asks for a retail format. Shopper's Stop is a well-known Indian retail chain, so we need the format that suits its way of selling.
Step 2: Recall the format:
A department store is a large retail outlet. It is divided into departments, and each department sells a different line of goods.
Shopper's Stop sells clothing, footwear, accessories, cosmetics, home products and more, under one roof, in separate sections.
Step 3: Why other formats do not fit:
A supermarket mainly sells food and grocery on a self-service basis.
A convenience store is a small shop near homes that stocks daily needs.
A specialty store sells only one line of goods. Shopper's Stop sells many lines, so it is none of these.
Final Answer:
Shopper's Stop is an example of a department store retail format.