Well since you don't give the passage, i can only assume you want to know what tumult means. tumult means, either a loud and confusing noise especially caused by a large crowd. or confusing/disorder
Answer is b being deceptive
I would say that it depends on the audience. Personally, a debate regarding ethics and moral dilemma is interesting. Read The Fat Man and the Impending Doom. It's just one paragraph so it's not going to bore audience.
https://thedailydilemma.wordpress.com/2007/06/18/fat-man/
I believe that this type is a lecture-forum discussion.
Answer:
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