Answer:
"To persuade people to demonstrate good manners at all times"
Step-by-step explanation:
By gathering information on the excerpt, we can see the answer is B because it states, "Good manners are not to be put on and off with one's best clothes. Politeness is an article for every-day wear."
More examples include:
"If you are not well behaved in your own family circle, you will hardly be truly so anywhere"
"The true gentleman or lady is a gentleman or lady at all times and in all places, ... A snob is a snob always and everywhere."