Need help in the specific contracts or laws that apply in each situation

a. Bailey's Fruit Stand orders 80 bushels of apples from Apple Grower's NW. Without stating a reason, Apple Grower's NW untimely delivers 30 bushels instead of the 80 bushels that were ordered. Does Bailey's Fruit Stand have the right to reject the shipment? Explain.

I am pretty sure that Bailey's fruit can accept or reject the shipment. They can refuse the 30 bushels, or accept them and ask for 50 more and tell Apple Growers NW not to do this again. I need to know what law makes it so that Bailey is legally able to refuse the shipment.

b. Apple Grower's NW agrees to sell to Bailey's Fruit Stand 100 bushels of apples, to be delivered on May 1. On April 1, a vehicle passing by throws out a cigarette and the the whole apple orchard goes up in flames. Is Apple Growers's NW liable to Bailey's for the shipment and must Bailey's pay Apple Grower's?

c, Apple Grower's NW plants ten acres of Cosmic apples. Harry and David Holdings Inc. agrees to buy all of the apples that Apple Grower's can produce. What kind of a contract is this? Explain.

d. What if Harry and David Holdings Inc. agrees to purchase from Apple Grower's NW all the Cosmic Apples they need to fulfill their Valentine Day orders. What kind of a of a contract is this? Explain.