In which of the following countries does Uniqlo operate stores?

Uniqlo operates stores in Japan, China, the United States, and the United Kingdom, making this option accurate. The brand has expanded significantly beyond its home country, Japan, establishing a robust presence in major international markets. This global expansion strategy reflects Uniqlo's ambition to be a leading player in the worldwide retail fashion industry by catering to diverse customer needs and preferences in various countries.

The other options imply a more limited presence for Uniqlo. For instance, stating that Uniqlo operates only in Japan and South Korea significantly understates the brand's global reach. Similarly, claiming that it operates only in major cities worldwide does not accurately reflect the company's specific market presence in recognized countries. Stating that Uniqlo operates exclusively in Europe is also inaccurate, as the brand has established itself in key markets outside Europe, including Asia and North America.