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问题
一个向量组 $A = (\alpha_{1}, \alpha_{2}, \cdots, \alpha_{s})$ 可由另一个向量组 $B = (\beta_{1}, \beta_{2}, \cdots, \beta_{t})$ 线性表示（线性表出）的【充分必要条件】是什么？选项
[A]. r(A) < r(A,B)[B]. $r(A) = r(A,B)$
[C]. $r(A) \neq r(A,B)$
[D]. $r(A) > r(A,B)$
$r(A) = r(A,B)$