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Question:

Which of the following techniques is most effective when defending a scientific argument?

A Showing the results of scientific experiments that support your argument.
Explaination

The most effective way to defend a scientific argument and advance a position is to apply the scientific method: design and perform an experiment to test the hypothesis in question. If the results of the experiment seem to agree with the hypothesis, then this supports the argument, though further experiments may serve to strengthen it. While the other choices may have some psychological sway in moving people to agree with the arguer, they are not considered persuasive scientific evidence.