Which of the Following Resonance Structures for OCN^- Will Contribute

Which of the following resonance structures for OCN^- will contribute most to the correct structure of OCN⁻?

A) O(2 lone pairs) =C=N(2 lone pairs)
B) O(1 lone pair) ≡C-N(3 lone pairs)
C) O(1 lone pair) =C(2 lone pairs) =N(1 lone pair)
D) O(3 lone pairs) -C≡N(1 lone pair)
E) They all contribute equally to the correct structure of OCN^-.