Stability of the species $Li_2, Li_2^-$ and $Li_2^+$ increases in the order of :

Question

( A ) $Li_2^- < Li_2^+ < Li_2$
( B ) $Li_2^- < Li_2 < Li_2^+$
( C ) $Li_2 < Li_2^- < Li_2^+$
( D ) $Li_2 < Li_2^+< Li_2^-$