It can be inferred that Ulysses S. Grant and Sam Watkins write memoirs about the Civil War because he wanted to "to provide their account of what happened during the war" (Option A)
An inference is the judgment or conclusion reached by rationally examining a text.
Thus, to state that Ulysses S. Grant and Sam Watkins write memoirs about the Civil War because he wanted to "to provide their account of what happened during the war is correct.
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