I believe the right answer is most likely the first option: A) Your face is as white as a lily.
This line was taken from the third stanza of the poem "La Belle Dame Sans Merci", by John Keats. The full stanza is as follows:
<em>I see a lily on thy brow,
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<em>With anguish moist and fever-dew,
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<em>And on thy cheek a fading rose
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<em>Fast withereth too.</em>
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In the beginning of the poem, the speaker is asking a knight what happened to him, why he looks so sad and distressed. His face is pale and moist, like a lily. From the fourth stanza on, the knight tells his tale. He met a fairy in the woods and was seduced by her. In the end, however, he is imprisoned by the fairy and condemned to a sad fate.
<em>And this is why I sojourn here,
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<em>Alone and palely loitering,
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<em>Though the sedge is withered from the lake,
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<em>And no birds sing.</em>