We can actually see that the argument the author presents in lines 8-10 is: D. One is not expected to threaten, harm or injure people or property.
Argument, refers to the statement (s) that are made with the intention of determining the degree of truth of another statement.
We see here that the author presents an argument in lines 8-10 and the argument is "one is not expected to threaten, harm or injure people or property."
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