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设向量组 $\alpha_1=(1,-1,2,4), \alpha_2=(0,3,1,2), \alpha_3=(3,0,7,14)$, $\alpha_4=(1,-2,2,4), \alpha_5=(2,1,5,10)$ ,则该向量组的极大线性无关组是
A. $\alpha_1, \alpha_2, \alpha_3$     B. $\alpha_1, \alpha_2, \alpha_4$     C. $\alpha_1, \alpha_2, \alpha_5$     D. $\alpha_1, \alpha_2, \alpha_4, \alpha_5$         
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