Poor An an. That's so devastating and would definitely hurt her impression of relationships.
People are often so caught up in the idea if falling in love that they forget the effort needed to STAY in love. I think everlasting love is possible but only with constant effort and dedication on both sides. It's not something you can expect to happen on its own.
Sorry to burst some bubbles, but the answer is mostly B.
Not saying you won't love the same person (everlasting), but that love- is always a-changing.
It can be lusty, drastic, dull, gooey, passionate, sweet, sour and sometimes stretches thin.... and sometimes it's all that in just one day. It can be tiring but yet you still work on it if it's important enough to you and you're getting as good as what you give.....
I know because I am very old, and have been married 219,4736ej3746fkK years