Many scientist believe that dinosaurs became extinct due to

The correct answer would be mass extinction due to meteor collision.

Explanation:

There are many different theories about the extinction of the dinosaurs. But many suggest extinction occurs due to meteor or asteroid collision. They believe that 65 million years ago an asteroid or meteor collided with earth and a huge amount of dust and debris covered global climate and environment. Due to this sunlight was not able to come to earth that is important for all the cycles and also primary source of energy for any ecosystem which ultimately lead to famous mass extinction.

Thus, the correct answer would be mass extinction due to meteor collision.

it is either c or d and i know for sure it is not a or b