Geologists Suspect a Large Asteroid Struck the Earth 65 Million

Geologists suspect a large asteroid struck the Earth 65 million years ago. What are the most probable ecological consequences from such an impact?

A) The asteroid's impact would have altered the tilt of the Earth and the timing of the seasons, resulting in extensive failures in plant reproduction.
B) Lifeforms transported by the asteroid would have caused disruptions to the evolution of life on Earth.
C) The ash cloud created by the impact would have magnified the greenhouse effect at least a thousandfold, causing massive goal warming.
D) The ash cloud created by the impact would have reduced solar radiation to the extent that photosynthesis was no longer possible.