A. There should be an apostrophe on the it's, because it is saying, "only some of it is clean and safe enough to drink." The apostrophe should be on that word because it breaks the word down into it is, which is correct in the sentence.
Half of his tragic flaw is anger, as it caused him to kill his father. The death of his father is a very large part of his downfall. Another flaw is his pride, as he refuses to accept his fate. His main strength, however, is his intelligence. He was courageous, which allowed him to confront and destroy the sphinx.
They're a form of nonfiction. (is this multiple choice?)
