What were some of the first crops to be domesticated during the agricultural revolution

The segments shown below could form a triangle.

In the 1980s, more russians worked to encourage change in the government by a) establishing a new political system. b) rallying for democratic reforms. c) supporting the democratic system. d) resisting gorbachev’s reforms.

Look at the graph. where p is price and q is quantity, what might cause a move from b to a?