$\text{A.}$ $\alpha_1+\alpha_2, \alpha_2+\alpha_3, \alpha_3+\alpha_1$
$\text{B.}$ $\alpha_1-\alpha_2, \alpha_2-\alpha_3, \alpha_3+\alpha_1$
$\text{C.}$ $\alpha_1, \alpha_1+\alpha_2, \alpha_1+\alpha_2+\alpha_3$
$\text{D.}$ $\alpha_1-\alpha_2, \alpha_2-\alpha_3, \alpha_1-\alpha_3$
$\text{E.}$
$\text{F.}$