Which major international food retailer originally started as a small grocery store selling only Carnation milk, Libby's canned goods, and donuts?

The grocery industry has evolved dramatically over the decades, with some of today's biggest food retailers starting in surprisingly different businesses. This trivia question explores how one major food retailer transformed from a small specialty shop into a global phenomenon, changing their business model to adapt to consumer needs and market opportunities.

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Whole Foods Market
Tesco
Walmart
Carrefour