See? That's exactly what's wrong with school today. Those are very good and creative answers (can you really say that any are actually incorrect?). Unless it's a class for psychics, why would he need to only pick the answer the teacher wants to hear?
Students that are completely brainwashed to believe there's only one answer to a question are NOT prepared for real life IMO!
My favorite example comes from this question: What is the square root of 4?