The so-called "Dark Romantics" notwithstanding, the best answer would be
C. Innocence
William Blake, although considered a "Pre-Romantic," wrote a book of poetry entitled, "Songs of Innocence and of Experience" -- in which he wrote
"Piping down the valleys wild Piping songs of pleasant glee On a cloud I saw a child. And he laughing said to me.
Pipe a song about a Lamb; So I piped with merry chear, Piper pipe that song again— So I piped, he wept to hear.<span> </span>
...And I wrote my happy songs Every child may joy to hear"
This typifies Romanticism, in that the child, like the "Noble Savage"-indigenous peoples in pre-industrializing areas of the 18th- and-19th-centuries, remains in an effectively "unspoiled" state of being.
Please don't think that im a hacker or anything. But brainly didn't allow me to send over 5000 characters. Please trust me on this. I sent the whole essay here:
https://pastebin.com/PTLHsh2z
Please re-read it just to make sure it is all correct.