Why did Borders (bookstore) fail in 2011?
A. Its loyalty program required customers used a membership card
B. An across the board price marked down
C. It went heavy into CD music sales and DVD just as the industry was going digital
D. It outsourced its online operations to Amazon
I know C. and D. were both reasons, but which is the best answer? Which caused it to ultimately fail in 2011 the most?