The linear combination of atomic orbitals to form molecular orbitals takes place only when the combining atomic orbitals:
$A$. have the same energy
$B$. have the minimum overlap
$C$. have same symmetry about the molecular axis
$D$. have different symmetry about the molecular axis
Choose the most appropriate from the options given below:

• A
  $A, B, C$ only
• B
  $A$ and $C$ only
• C
  $B, C, D$ only
• D
  $B$ and $D$ only