Answer:
A) Has the lowest concentration of large firms.
Explanation:
Before Amazon existed, some retail chains were very big, specially large department stores (e.g. JC Penny, Sears, Macy's, Toys R Us, etc.) but most of these large corporations have reduced their number of stores and many are barely surviving. But even then. the number of large retail chains, including supermarkets and grocery stores, was relatively small compared to the total number of retail stores. Walmart is currently the largest retailer (previously it was Sears), but the vast majority of retail stores (98%) are small businesses, usually run by families.
