C, the antagonist. Unless you're talking about the anime Kill Me Baby. Then it's D, a minor character. But otherwise, don't mind that last sentence, The answer is C.
Answer: Vegitarian/Vegan
Explanation: I'm not sure if this is the answer your looking for, but it could be that some people that dont eat meat/animal products.
The author compares imagination to a soaring bird in this poem (A). For example, the text states that "Or who describe the swiftness of thy course? Soaring through air to find the bright abode . . ." This quote from the text supports that the author uses imagination to refer to a soaring bird flying swiftly in the air.