When a user selects a item in a list, the application displays data about that...

In the context of copying data from a data page to a page property in Pega:

C. The next time the property is accessed. The data is copied to the property again whenever the property is accessed, ensuring that the most current data from the data page is reflected. This behavior is part of Pega's strategy to maintain updated and relevant data within user interactions, particularly in dynamic environments where data can change frequently.