C is the answer for this my dude
The indefinite word in this sentence is "all'' because it is formed from a indefinite pronoun therefore it is a indefinite adjective.
It would help to read the poem, but based simply on the word, I would say it is used either in a negative way or inspiring way.
If you could let me know what poem it is, I may be able to help better :-)
Harper Lee characterizes Atticus as a hard working attorney who’s pretty straightforward with his children, especially scout.