Sentence Correction (SC) | Re: To popularize the asteroid theory of dinosaur extinction,

To popularize the asteroid theory of dinosaur extinction, paleontologistshave to provide somewhat stronger evidence than now linking the disappearance of fossil records and the layer of sediment in the Earth's crust caused by an asteroid impact.
A) have to provide somewhat stronger evidence than now linking
B) have to provide somewhat stronger evidence than they do now and link
C) would have to provide somewhat stronger evidence than they do now and link
D) would have to provide somewhat stronger