2 下列集合中之向量，何者為線性獨立（linearly independent）？
(A){(3, 1, − 4), (2, 0, −1), (3, −1, 1)}
(B){(1, 2, 0), (−1,1, 2), (3,1, 5), (0,1, −1)}
(C){(1,1, − 2), (0,1, 0), (2,1, −1)}
(D){(3,1, 0), (2, −1,1), (1, 0,1), (2,1, −1)}

S=｛v1,v2,...,vn｝a1v1...