单选题:设A、B、C均为n阶方阵,AB=BA,AC=CA,则A(B+C)=(  )

题目内容:
设A、B、C均为n阶方阵,AB=BA,AC=CA,则A(B+C)=(  ) A.(A+B)C
B.(B+C)A
C.A(B+C)
D.(A+C)B
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