Textbook Problem

elect which of the following ions has the Lewis structure:

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msp;  $\begin{array}{l}\text{a}.{\text{ B}}_{\text{2}}{}^{\text{2}—} \text{d}.{\text{ O}}_{\text{2}}{}^{\text{2}—}\\ \text{b}.{\text{ C}}_{\text{2}}{}^{\text{2}-} \text{e}.{\text{ F}}_{\text{2}}{}^{\text{2}—}\\ \text{c}.{\text{ N}}_{\text{2}}{}^{\text{2}—}\end{array}$