Concept:Small-scale retail outlets survive by offering close, personal service that large stores often cannot provide.
Explanation:Small-scale retailers operate on a small capital base, so they cannot buy in bulk or offer self-service facilities.
Their main strength is direct contact with customers.
This allows them to know their customers personally, understand their preferences, and give individual attention.
They also make quick decisions and can sell in smaller quantities.
However, among the options given, personal attention is the clear advantage of a small retail outlet.
Answer:D. personal attention to customers