18. _____, the history of civilization would have to be rewritten.
(A) If the artists and creative thinkers would dare to be different
(B) Have the artists and creative thinkers dared to be different
(C) Had the artists and creative thinkers not dared to be different
(D) If the artists and creative thinkers dared to be different
(E) The artists and creative thinkers had not dared to be different