哪个连锁店拥有最完善的供应链体系?

A. Walmart B. Amazon C. Costco D. McDonald's

The correct answer is A. Walmart.

Walmart has the most comprehensive and robust supply chain system among the four options listed. They have a global network of suppliers, distributors, and fulfillment centers that work together seamlessly to ensure that products are delivered to customers quickly and efficiently. Walmart also invests heavily in technology and automation to optimize their supply chain operations.