The following text is adapted from Daniel Defoe's 1704 nonfiction book The Storm.
If I judge right, 'tis the duty of an historian to set everything in its own light, and to
convey matter of fact upon its legitimate authority, and no other: I mean thus, (for
I would be as explicit as I can) that where a story is vouched to him with sufficient
authority, he ought to give the world the special testimonial of its proper voucher,
or else he is not just to the story: and where it comes without such sufficient
authority, he ought to say so; otherwise he is not just to himself.
Which choice best states the main idea of the text?