30. Who were Voltaire, Montesquieu, Diderot, and Condorcet? (Pgs. 330-333) a. They were French philosophers who promoted ideas during the
period.

They were French philosophers who promoted ideas during the  Enlightenment period.

Explanation:

All of the mentioned figures lived in the 18th Century. They believed that the government should function for the benefit of the ordinary people. That is why they were stressing the natural rights of the people, and believed that those rights should be above the divine rights of the king.

Therefore, some of them were regarded as a threat by French rulers.

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 ! : )