The answer is A
Just because an essay may have bias doesn’t mean that the evidence is null and void.
A part of deconstructing an argument is identifying bias and understanding why someone thinks that way.
Hope this helps.
It seems that you have missed the necessary options for us to answer this question, so I had to look for it. Anyway, based on the given lines above, the literary device that Sophocles uses in these lines to keep the audience interested is DRAMATIC IRONY. Hope this helps.