During the Cretacous time period Dinosaurs experienced an extinction. What was the major cause of the dinosaurs extinction? А. A comet hit all the dinosaurs at one time.
B. A meteor killed all the dinosaurs food source.
С. The dinosaurs migrated from the meteor impact and were unable to survive in their new habitat.
D. The dinosaurs were unable to adapt to a rapid change in their environment.

D. The dinosaurs were unable to adapt to a rapid change in their environment.

Explanation:

As originally proposed in 1980 by a team of scientists led by Luis Alvarez and his son Walter, it is now generally thought that the K–Pg extinction was caused by the impact of a massive comet or asteroid 10 to 15 km (6 to 9 mi) wide, 66 million years ago, which devastated the global environment, mainly through a ...

the answer is b. hope this !