Choose from the alternatives A, B, C and D one best way to make a meaningful sentence.
Women can delay having children due to effective birth control methods.
A.If there aren’t effective, women cannot delay having children.
B.Unless women could delay having c hildren, there weren’t effective.
C.If there were not effective, women couldn’t delay having children.
D.If there hadn’t been effective, women could not have delayed having children.