Gabriela's Is a Women's Clothing Retailer Headquartered in Spain with Stores

Gabriela's is a women's clothing retailer headquartered in Spain with stores located in many countries. Gabriela's has developed a "quick response" system that allows store merchandise to be adjusted rapidly to fit changing customer preferences. Every aspect of Gabriela's operation is optimized for this system, making it difficult for competitors like The Gap to duplicate. Gabriela's has established

A) customer loyalty.
B) locational excellence.
C) a diversification growth strategy.
D) a sustainable competitive advantage.
E) a related diversification opportunity.