I would say the first option. "river knows. I from man conceal". To me says nature knows but he's hiding it from people.
The correct answer is B indeed. It is an example of plain folks because the speaker appeals to the citizens of his town, and to the knowledge that he shares with the other members of the community. This strategy is quite basic, as shown by this example, because the author makes a claim that most people would agree with, without actually providing evidence or a series of logical arguments.
C. I found a bag of marbles.
This is the only sentence that contains an indefinite article. Indefinite articles are "a" and "an" for singular nouns. "some" is the indefinite article used for plural or uncountable nouns.
"the" is a definite article.
Are you sure it's a word? I can't seem to find it anywhere.
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