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.
Uh, I don't know what you need help with, but I will answer 'What does everyone have planned for tomorrow''. I got school! ;) Remember to ask a question, though.
Answer:
3.
Explanation:
3 is the only one with an action being preformed by a specific person.