Final answer:
The correct action to take when a nutrition worker inadvertently contaminates a pan of peaches by touching a student's tray with the serving scoop is to discard the entire pan of peaches.
Step-by-step explanation:
The situation described involves a potential issue of food safety in the school lunch program. When the nutrition worker realized that the scoop, which had touched a child's tray, was then put back into the pan of peaches, action needed to be taken to prevent cross-contamination. The most appropriate response to immediately remedy this would be to discard the entire pan of peaches. This action is necessary because there is a risk of contamination from the tray to the peaches, which could affect other students who take fruit from the same pan. Subsequent steps should include discussing food safety protocols with the worker to prevent future occurrences.