When $\psi_A$ and $\psi_B$ are the wave functions of atomic orbitals,then $\sigma^*$ is represented by :

• A
  $\psi_A - 2 \psi_B$
• B
  $\psi_A - \psi_B$
• C
  $\psi_A + 2 \psi_B$
• D
  $\psi_A + \psi_B$