Accreditation I believe:)
They should interview other people who fought in that same war ( which would be back up witness for these two different accounts). So whoever has the most back up witnesses must be telling the truth ( also make sure the other people you interview don't know they are back up witness).
D they surprised the Persians by crossing the Aegean Sea to attack
Answer:
B!
Explanation: B, correct me if I'm wrong! <3333