The three characteristics that apply to an effective opening statement are:
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States the writer’s opinion - An effective opening statement clearly presents the writer's viewpoint or stance on the issue.
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Debatable - It should present an argument that can be argued for or against, making it worthy of discussion.
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Logical - The statement should be coherent and logically structured, providing a solid foundation for the argument that follows.
So the correct selections would be: "states the writer’s opinion," "debatable," and "logical."