A school-age child with leukemia experienced severe nausea and vomiting when receiving chemotherapy for the first time. Which is the most appropriate nursing action to prevent or minimize these reactions with subsequent treatments?

A. Administer an antiemetic before chemotherapy begins is the most appropriate action. Chemotherapy-induced nausea and vomiting can be anticipated, so administering an antiemetic before treatment helps to prevent these symptoms from occurring. This proactive approach is standard practice to manage chemotherapy side effects. B. Encourage drinking large amounts of favorite fluids may help with hydration, but it doesn't specifically target nausea or vomiting. It’s better to focus on a strategy to directly prevent these symptoms, such as using antiemetics. C. Offer frequent small meals before and after chemotherapy may help with general appetite and nutrition, but it doesn't directly address nausea and vomiting from chemotherapy. D. Provide the child's favorite music as a distraction can be helpful for comfort but does not address the underlying issue of chemotherapy-induced nausea and vomiting.