Answer:
1.Oil prices and economic inefficiency
2.Ethnic tensions
3.Gorbachev’s reforms
Explanation:
I believe it would be answer C
The other method of passing an amendment requires a Constitutional Convention to be called by two-thirds of the legislatures of the States. That Convention can propose as many amendments as it deems necessary. Those amendments must be approved by three-fourths of the states.
The bubonic plague caused one third (1/3) of Europe's population to meet their painful demise.
