The first people to establish a civilization in the mesoamerica are believed to have been 1) aztecs 2) olmec 3)iroquois 4 ) maya

Option B is the right answer.

Explanation:

This civilization endured on the Mexican Bay. They are known for the making of gigantic massive figure or sculpture of heads. It spread its influence on Aztecs and Maya civilization.  

This civilization is pure and pristine as they did not depend upon migration to achieve survival. Stone figurines and wooden relics are the only remnants of this civilization. Interaction with the holiness was the significant part of their life. Human sacrifice was practiced by Olmecs.  

They believed in the existence of super natural being. They were talented in sculpting and engineers. They were honest traders and no one knew how the civilization experienced the downfall as they had no rivals.

i believe the correct answer is option b. most eastern european nations joined nato.

though i could be wrong, option d. the eastern european nations were granted complete independence, would be another choice.

hope this ! : )