The social commentary Mark Twain made from the excerpt was that Rich Londoners would spend huge sums of money to gain popularity in the upper class of London.
That is option D.
Social commentary is the act of advertising a fact to the society and a way of making your opinion known about a particular issue.
The excerpt from "The £1,000,000 Bank-Note" portrayed the message that money does not corrupt men, but it actually reveals their true self and the kind of men they are.
Therefore, the social commentary Mark Twain made from the excerpt was that Rich Londoners would spend huge sums of money to gain popularity in the upper class of London.
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