I would say the correct answer is B. The description of Lucynell's hair and eyes lends her an image of angelic innocence. Lucynell is an innocent person who can't take proper care of herself and spends her life in an isolated, desolate environment with her mother. Mr. Shiftlet uses her to acquire her mother's car. So, this simile works as part of juxtaposing Lucynell to Mr. Shiftlet, who is clever, agile and unscrupulous in his quest.
