When the reaction $O_2 + e^- \to O_2^-$ occurs,identify the molecular orbital into which the electron is added.

  • A
    $\sigma_{2p_z}$
  • B
    $\pi_{2p_x}^*$
  • C
    $\pi_{2p_x}$
  • D
    $\sigma_{2p_z}^*$

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