已知向量组 $\boldsymbol{\alpha}_1, \boldsymbol{\alpha}_2, \boldsymbol{\alpha}_3, \boldsymbol{\alpha}_4$ 线性无关，则向量组
A. $\boldsymbol{\alpha}_1+\boldsymbol{\alpha}_2, \boldsymbol{\alpha}_2+\boldsymbol{\alpha}_3, \boldsymbol{\alpha}_3+\boldsymbol{\alpha}_4, \boldsymbol{\alpha}_4+\boldsymbol{\alpha}_1$ 线性无关。
B. $\boldsymbol{\alpha}_1-\boldsymbol{\alpha}_2, \boldsymbol{\alpha}_2-\boldsymbol{\alpha}_3, \boldsymbol{\alpha}_3-\boldsymbol{\alpha}_4, \boldsymbol{\alpha}_4-\boldsymbol{\alpha}_1$ 线性无关。
C. $\boldsymbol{\alpha}_1+\boldsymbol{\alpha}_2, \boldsymbol{\alpha}_2+\boldsymbol{\alpha}_3, \boldsymbol{\alpha}_3+\boldsymbol{\alpha}_4, \boldsymbol{\alpha}_4-\boldsymbol{\alpha}_1$ 线性无关．
D. $\boldsymbol{\alpha}_1+\boldsymbol{\alpha}_2, \boldsymbol{\alpha}_2+\boldsymbol{\alpha}_3, \boldsymbol{\alpha}_3-\boldsymbol{\alpha}_4, \boldsymbol{\alpha}_4-\boldsymbol{\alpha}_1$ 线性无关．