The author focuses on politeness, as it comes as a social commentary and formalities can be unproductive.
Social commentary is the ability to create a social awareness among general public regarding everything that is going on around us. Social awareness is very important in our day-to-day life as it helps us learn things on our own and from our own mistakes.
In the given prose, the author focuses on politeness as it is unnecessary in the social life nowadays. The excerpt - "how the animals lost their tails and got them back travelling from Philadelphia to medicine hat" says that the formalities in our daily lives are very much unproductive.
Thus, the author focuses on politeness in the given excerpt.
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C because that person is looked up to by many people. They are wise and give good advice. So most likely many people would accept their recommendation. <span />
The answer would be D because A, B, and C are not relevant to her side of the argument. Those three letters really refer to the opposing side rather than her's. D is the only answer that seems logical for her to pick because it could be information that could be used on her side of the argument.
Your answer is A Hope this helps