Final Answer:
When Wendy and Peter tell each other goodbye, Wendy reminds Peter to change his socks and take his umbrella.
Step-by-step explanation:
The question is asking for two things that Wendy reminds Peter to do before they part ways. Based on the context of the question, it can be inferred that Wendy is reminding Peter to change his socks and take his umbrella.
Firstly, changing socks is important to ensure that Peter is wearing clean and dry socks, especially if he has been wearing the same pair for an extended period of time. This is especially true if Peter is going to be walking or engaging in any physical activities, as wearing clean socks can help prevent foot odor and prevent blisters or other skin irritations.
Secondly, taking an umbrella is important because it can help protect Peter from the elements, such as rain or sun exposure. This is especially important if Peter is going to be outside for an extended period of time, as exposure to the elements can cause discomfort and potentially lead to health problems.
Overall, both changing socks and taking an umbrella are important reminders for Peter to ensure that he is prepared for his next activity or destination, and that he is taking care of his personal hygiene and well-being.