They are trying to judge your potential as a teacher. They want to know what you think, not what you think they want to hear. The number of words specified gives you an idea of the amount of detail you need to give.
This may seem unhelpful, but they want to know about you, not us. Don't forget, this is a pre-CELTA task. You are not epected to give expert answers. If you could, you would not need to go on the course.