You should talk about how businesses do unethical acts behind our back. Specifically if a butchering company found some sort of cancer in their meat, and removed it immediately without telling anyone, would be ethical or unethical? Put it in a "gray zone".
The answer is D. A symbol is an ordinary object that takes on significance outside itself and stands for something greater.
A symbol is something in the novel, that doesn't necessarily have to be big or directly related to the main character, but always stands for something greater.