18 若矩陣 ，則下列何者正確？ 

(A)假如 a = 8 則 rank [A] = 2，rank 為矩陣之秩數 

(B)假如 a = 8 則 rank [A] = 3，rank 為矩陣之秩數 

(C)假如 a = 1 則 rank [A] = 2，rank 為矩陣之秩數 

(D)假如 a = 3 則 rank [A] = 2，rank 為矩陣之秩數

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統計： A(2), B(0), C(0), D(0), E(0) #1047217