The three characteristics that apply to an effective opening statement are:
- Dejetable - An effective opening should present a viewpoint that can be debated, encouraging discussion.
- States the writer’s opinion - It should clearly convey the writer's position or perspective on the topic.
- Logical - It should be reasoned and coherent, establishing a foundation for the argument or discussion to follow.
So, the correct responses are: debatable, states the writer’s opinion, and logical.