A sentence, to be a sentence, must contain a subject and a verb. In A there is no subject, who/what is "receiving intravenous antibiotics"
Well, the poem evolves around settings such as twilight, dusk, fire, plants, and birds. I would personally say the meaning behind it could vary between physically dark occurrences that aren't viewed as a true form! ( if ya get what I'm sayin)
A was the correct answer, hope this help :3
Sorry bud, but i cant help you