Which food retailer is credited with inventing the modern supermarket concept in 1916 by introducing the revolutionary self-service shopping model?

Before Walmart and Amazon dominated grocery retail, one company pioneered the modern supermarket concept that forever changed how Americans shop for food. Test your knowledge of retail chain history that transformed the food industry landscape and set the foundation for today's grocery shopping experience. Can you identify which pioneering food retailer introduced the revolutionary self-service shopping model that became the standard worldwide?

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Piggly Wiggly (founded by Clarence Saunders)
A&P (The Great Atlantic & Pacific Tea Company)
Kroger (founded by Bernard Kroger)
Safeway (originally Skaggs Cash Stores)