Bond between $A$ and $B$ can be represented by $A-B, A^{+} B^{-}, A^{-} B^{+}$ (I) (II) (III) If $A$ is more electronegative than $B$, then least contribution to the actual structure comes from

• A

  I
• Correct answer
  B

  II
• C

  III
• D

  All the structures have equal contribution

Hence, the correct answer is option: 'B'.