For further questions on to kill a mockingbird I suggest Sparknotes. It’s a site. I looked up your question and found sparknotes. My Answer: I would say the existence of social inequality.
What are we supposed to answer
Because the seethe results and it hurts their undeveloped mind<span />
A simple subject is just one word, and here, the correct answer is <span>C. branch.
</span>If the question was - which word or phrase is the complete subject, then the branch of medicine that deals with athletic injuries would be the answer.