Which retail innovation first introduced the self-service concept where customers could select their own merchandise without clerk assistance?

The modern retail landscape wasn't always dominated by self-service shopping. For centuries, customers had to ask clerks behind counters to retrieve products for them. This poll tests your knowledge about a pivotal innovation that fundamentally changed how we shop and set the foundation for today's retail environment. Do you know which pioneering retail format first introduced the revolutionary concept that customers could select their own merchandise without clerk assistance?

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Piggly Wiggly stores (1916)
Woolworth's five-and-dime stores (1879)
A&P Economy Stores (1912)
Marshall Field's department store (1897)