bussiness law

On October 5, 2019, Arthur offered to sell 100,000 bushels of potatoes at $3.00 per bushel to Brian. Despite a volatile market for potatoes, Arthur promised to keep his offer open for five days. On October 7, 2019, however, a major fast-food chain of restaurants offered to purchase Arthur's entire inventory of potatoes for $1,200,000. As this was an exceptionally good offer, Arthur accepted. On October 9, 2019 Brian called Arthur and told him that, although he had heard about the sale to the fast-food chain from one of Arthur's employees, he was accepting Arthur's original offer. a. Is there a contract between Arthur and Brian for the purchase and sale of 100,000 bushels of potatoes? Explain. (2 points) b. How could Brian have avoided this risk and ensured that Arthur's offer to sell the potatoes would be binding on him? Explain. (2 points)