What was the most shocking part of "To Kill a Mockingbird" and why?
A. Tom Robinson's trial - because of the racial injustice and unfair treatment.
B. Boo Radley's revelation - because it challenges the assumptions made about him.
C. Mayella Ewell's accusation - because it exposes the prejudices within the community.
D. Atticus Finch's defense - because it challenges societal norms and expectations.