Throughout the novel, mockingbirds symbolically represent innocent, defenseless beings, who bring peace and joy to the world. In chapter 10, Atticus explains to his children that it is considered a sin to kill a mockingbird. Miss Maudie elaborates on Atticus's statement by mentioning that mockingbirds do nothing to harm or annoy humans and simply make beautiful music for everyone to enjoy.
So the answer would be B. The mockingbird symbolizes the softer side of nature, because unlike most wild creatures, it doesn’t harm human habitat.