16. Consider a series of matrices M2×3, M3×7,M7×2,M2×9, M9×4. Concerning the most efficient way to multiply this sequence of matrices, how many multiplication operations does it need?
(A) 112
(B) 126
(C) 142
(D) 156
(E) 178

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統計： A(0), B(0), C(0), D(1), E(0) #3808183