The three characteristics that apply to an effective opening statement are:
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Debatable - An effective opening statement should present an argument that can be debated or discussed.
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States the writer’s opinion - It often reflects the writer's viewpoint, setting the stage for the argument.
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Logical - A logical opening statement helps to establish a clear and coherent foundation for the discussion that follows.
So the correct answers would be: debatable, states the writer’s opinion, and logical.