please please help. I need help with three questions about demand and supply

questions:

1. (a) Construct a graph to show the general shifts in supply and demand of agricultural products since the end of World War Il (that is, over the long run).

(b) What does the graph illustrate about the changes in the general prices of agricultural products?

2. What problems do farmers face over the short term?

3. Construct a second graph to illustrate the effects of marketing boards on the price and supply of agricultural products. Explain the graph.

the answers can be found in this small reading.. (let me know if u can't see the picture clearly. thank you for your help :)))