[Solved] In which case is the offer still valid at the time the acceptance is made? A) Hal offered to sell a book to Sid. Hal died, and Sid sent an acceptance two days later. B) By-Waste Co. telephones XXX Co. offering to dispose of XXX Co.'s chemical waste by a particular method. XXX says it has another way to dispose of the waste. Then XXX finds out the method it planned to use violates environmental protection statutes, so it sends a letter of acceptance to By-Waste. C) Ray offers to sell his AT&T stock for a particular price by May 1. On May 2, Kathy agrees to buy the stock. D) In a face-to-face transaction, Pat offers to sell Mike his stereo and Mike accepts. E) All of the above. Unethical Research: Studies or experiments conducted in violation of ethical standards, often involving harm or risk to participants without their informed consent. Animal-To-Human Organ Transplants: The surgical procedure of transferring organs or tissues from animals to humans, also known as xenotransplantation, to replace damaged or nonfunctional human organs. Eugenics Movement: A social and scientific movement that advocates for the improvement of the human population through controlled breeding to increase the occurrence of desirable heritable characteristics. AMA Code of Ethics: The set of ethical guidelines and principles adopted by the American Medical Association to guide the professional conduct of its members.