Atoms A and B are interacting to form bonds $(\sigma, \pi)$. If $z$-axis is taken as the internuclear axis, the correct statement regarding the formation of a bond is

• A

  $p_z^{\mathrm{A}}$ and $p_z^{\mathrm{B}}$ atomic orbitals contribute to $\pi$ bond.
• B

  $d_{x^2-y^2}^{\mathrm{A}}$ and $d_{x^2-y^2}^{\mathrm{B}}$ atomic orbitals contribute to $\pi$ bond.
• C

  $p_y^{\mathrm{A}}$ and $p_y^{\mathrm{B}}$ atomic orbitals contribute to $\sigma$ bond.
• Correct answer
  D

  $d_{z^2}^{\mathrm{A}}$ and $d_{z^2}^{\mathrm{B}}$ atomic orbitals contribute to $\sigma$ bond.

Hence, the correct answer is option: 'D'.