15. Amazon's use of the Internet as a platform to sell books more efficiently than traditional bookstores illustrates a use of information services for ________.
(A) low-cost leadership.
(B) Focusing on market niche.
(C) Strengthening supplier intimacy.
(D) Marketing effectiveness.

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統計： A(0), B(0), C(1), D(0), E(0) #2855535