Answer: C.
eliminated government regulations
Explanation:
All but B and E, the aztecs were not big conquers and the spanish wanted their gold, if the aztecs did not give it to them, they would die by the sword
B. A meteor or asteroid colliding with the Earth.
The Mesozoic Era lasted for approximately 180 million years and ended at about 250 to 65 million years ago. The 'Great Extinction' happened in this era and it marked an end to almost all forms of life.