Hmm...
Memory?
Because:
<em>
Today I will live my memory, tomorrow more memories will come. As time passes, memories aren't easy to remember, it doesn't take space, and it's only in one place, which is the pass. Memory is what we saw, but not see anymore.</em>
Haven't read that story, but going from the title I am going to say A.
You didn't attach anything that I can see...