Which of the following statements is incorrect regarding the $B-F$ bond in $BF_3$?

• A
  All three $B-F$ bond lengths are equal and each is shorter than the sum of the covalent radii of boron and fluorine.
• B
  The bond energy of the $B-F$ bond is very high,which is higher than the bond energy of any other single bond.
• C
  The unusual shortness and strength of the $B-F$ bond can be explained by $p\pi - p\pi$ interaction between boron and fluorine.
• D
  The unusual shortness and strength of the $B-F$ bond can be explained by $p\pi - d\pi$ interaction between boron and fluorine.