Needs some context whos buck is this from a book ? Or a movie?
Answer:
The keys
Explanation:
Keys is the object that is directly receiving the action; it cannot replace or describe the noun. (Keys is not Daniel.)
Table is an object of the preposition, since on is the preposition. That means on the table is just a prepositional phrase, and is not part of the S-Vt-DO sentence.
Therefore, the noun is Daniel, the verb-transitive is Daniel, and the Direct Object is keys.
It is
"The life of an immigrant is difficult.
Immigrants tend to live in one area."
I think.
From my my experience this usually differs depending on the type of book it is, but I think the best choice is either A, to help the reader understand new concepts, or C., It allows the reader to focus on key ideas and information during the reading. I'd pick C though, since it's more in depth and makes more sense.
B. doesn't make that much sense unless the book is an argumentative or a persuasive book.
D. only applies to personal narratives. Nobody can understand a writer's personal experiences and attitudes otherwise.