It's D. The verb 'remain' does not imply to stay some place.
They are alike by they can both be used as like a coloring word as in i spray the painting or I streak the brush along the tips of my fingers. they are different because they also have different meanings
One difference is the rhyme scheme. (option C)
For comparison:
English: (typically)
a-b-a-b, c-d-c-d, e-f-e-f, g-g.
Italian (typically)
a-b-b-a, a-b-b-a c-d-e-c, d-e.
I think it’s “the newest” or “newest”
