b. the standard of living for most people has worsened
Explanation:
On dec 25 1991 the soviet union was dissolved and along with the independence of the 15 independent republics and it began in the second half of the 1980s.
As the economic toes broke down there was a catastrophic fall in the standards of living of people in post soviet states and the eastern blocks and was worst than the great depression.
The earliest known centers of the plant domestication have taken place near the southeast Asia and in the Mesoamerica, ad along middle east Asia was the oldest sites of the fertile valleys and the place of the birth of civilization in the world.
