Answer:
B) Mike had a duty to come to their aid because he arranged the dive and was charging them.
Step-by-step explanation:
Mike organized the diving trip as part of his business activities. he is making money out of it, he is not doing it for free. He should haver warned the other divers about the risks involved and should also help them in case they are in trouble. When you provide a service, you are responsible for your customers' safety.