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,higher than that of any other single bond.
• C
  The unusual shortness and strength of the $B-F$ bond cannot 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 $p\pi-p\pi$ interaction between boron and fluorine.