D, D, Definitely D or D for "definitely", if you prefer.
I don't think it's A because I have never encountered a version of the Heavenly Courts where the fairies weren't the game of a (quite sexist) marriage hunt, and I don't think it can be B because if she could recognise what her feelings were, she would be more wary of Lin Muxi, as, iirc she was explicitly warned against falling in love with a mortal.
Finally, she clearly holds Lin Muxi in a different regard than anyone else she knows in the Mortal World, so I don't think C is any good either.