The best option for Tristan to handle the situation is: **He should listen carefully and try to help the customer regain her composure.**
Listening actively and showing empathy can help de-escalate the customer's distress. Once she feels heard, Tristan can gather more details about the issue and then determine the best course of action, such as involving a manager or the salesperson in question. This approach prioritizes customer service and addresses the customer's emotional state effectively.