设向量组 $\boldsymbol{\alpha}_{1}, \boldsymbol{\alpha}_{2}, \boldsymbol{\alpha}_{3}$ 线性无关, 则下列向量组线性相关的是 ( )
A. $\boldsymbol{\alpha}_{1}-\boldsymbol{\alpha}_{2}, \boldsymbol{\alpha}_{2}-\boldsymbol{\alpha}_{3}, \boldsymbol{\alpha}_{3}-\boldsymbol{\alpha}_{1}$.
B. $\boldsymbol{\alpha}_{1}+\boldsymbol{\alpha}_{2}, \boldsymbol{\alpha}_{2}+\boldsymbol{\alpha}_{3}, \boldsymbol{\alpha}_{3}+\boldsymbol{\alpha}_{1}$.
C. $ \boldsymbol{\alpha}_{1}-2 \boldsymbol{\alpha}_{2}, \boldsymbol{\alpha}_{2}-2 \boldsymbol{\alpha}_{3}, \boldsymbol{\alpha}_{3}-2 \boldsymbol{\alpha}_{1}$
D. $\boldsymbol{\alpha}_{1}+2 \boldsymbol{\alpha}_{2}, \boldsymbol{\alpha}_{2}+2 \boldsymbol{\alpha}_{3}, \boldsymbol{\alpha}_{3}+2 \boldsymbol{\alpha}_{1}$.