Which of the Following Statements About Zappos Is Most Accurate

Which of the following statements about Zappos is most accurate?

A) Zappos limits its inventory to an extensive selection of high-end fashion footwear.
B) Zappos carries more than 1,000 different brands.
C) Zappos can guarantee overnight shipping to all its customers because they know ahead of time what they will be charged for express service.
D) Zappos is so successful because it has chosen a single mission to "sell shoes and nothing else."
E) Zappos offers a 30/60/90 return policy whereby refunds are based on how long you've had the shoes.