Infer the meaning of the word "substantiate" based on the context clues provided in the paragraphs.
Paragraph 1 (Character Reaction): She gathered documents, charts, and firsthand accounts to strengthen her argument instead of resting on speculation.
Paragraph 2 (Cause and Effect): Because the witness shared recordings that aligned with his statement, the committee accepted the story.
Paragraph 3 (Contrast): While some claims floated without support, this one was reinforced with tangible proof.