The two correct answers for why authors use reasons and textual evidence to support their claims in research articles are:
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To clarify the researchers' claim - Providing reasons and evidence helps to clearly convey the author's argument and reinforces the validity of their claims.
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To explain why they structure their study the way they do - Authors often provide reasoning and evidence to justify their methodology and the framework of their study, demonstrating the rationale behind their research approach.
The other option, "to show the order they used when conducting their research," is less relevant in this context, as it does not directly pertain to supporting claims or arguments.