Answer:
remembering
Step-by-step explanation:
attending is simply being there, but this action is a little more in depth and complex so i'd say no to this one.
selecting is like picking out or choosing something, and that's not exactly applicable here.
understanding could be a possible option, however i think the question is directly asking what is this exactly referencing the act of.
i'd say remembering because when you're relating to something you have been through before, you're remembering the event that happened.