The answer is A. also the author.
The narrator of <em>The Bean Eaters</em> is<u> also the author</u>.
1. to(prep) Chicago (obj)
2. by(prep) car(obj)
3. By(prep) afternoon(obj)
4. for(prep) lunch(obj)
5. near(prep) river(obj)
6. on(prep) water(obj)
7. for(prep) trip(obj)
8. of(prep) Chicago(obj)
9. at(prep) motel(obj)
A preposition tells where one noun is in relation to another noun. It is always followed by a noun, which is the object of a preposition. One silly way to remember most prepositions is to think about a squirrel and a tree. A squirrel can go (through, on, under, in, off, to, by...) the tree. There are a few prepositions that just need to be remembered such as for.
Taking a position in an argument means taking a side. When taking a side in an argument, the author will most likely give you biased evidence. They will only give you reason to believe their side, without giving you any sort of evidence for the other side in the argument.
I hope this helps!