After the data has been copies to the property, when is the data copies to the property again?

When a user selects a item in a list, the application displays data about that item. Data is copies to a page property using the Copy from a data page options.

After the data has been copies to the property, when is the data copies to the property again?
A . Never
B . The next time the case is opened
C . The next time the property is accessed
D . When the item is changed

Answer: D