In a homonuclear diatomic molecule,which of the following sets of orbitals is degenerate?

• A
  $\sigma_{1s}, \sigma_{2s}$
• B
  $\pi 2p_x, \pi 2p_y$
• C
  $\pi 2p_x, \sigma 2p_z$
• D
  $\sigma 2p_x, \sigma^* 2p_z$