C. They help readers visualize complex and unfamiliar ideas.
The sentence that follows the correct apostrophe rule is option C. The book's story was pretty exciting, even though its cover was not. The correct placement of the apostrophe should be on the word "book's" because it shows ownership, which means "the story of the book". The word "its" should not have an apostrophe because "it's" is the shorter term for "it is".
I would try to find a Site with an ending of .edu. i would also try to search questions like why, where, who, and when. you would have to write the rest down i am sorry but i cannot think of anything else. Sorry!
~ShantiiCakes