The correct statements among $I$ to $III$ are:
$I$. Valence bond theory cannot explain the color exhibited by transition metal complexes.
$II$. Valence bond theory can predict quantitatively the magnetic properties of transition metal complexes.
$III$. Valence bond theory cannot distinguish ligands as weak and strong field ones.

• A
  $I$ and $II$ only
• B
  $I$,$II$ and $III$
• C
  $I$ and $III$ only
• D
  $II$ and $III$ only