40. It can be inferred from the passage that Michael Porter's theory suggests that _____.
(A)firms that fail to commit to a clear strategic position tend to struggle
(B)companies in the middle of the market outperform their competitors
(C)successful companies usually combine low cost and distinctive value
(D)differentiation is more important than cost control in retail businesses

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統計： A(0), B(0), C(1), D(0), E(0) #3915291