Which of the following should be considered when evaluating the credibility of a text based on the voice?

The option which should be considered when evaluation the credibility of a text based on the voice is B. whether or not there is bias. If a character is biased, it means that they will speak from their own perspective only - not taking into consideration other characters they may be speaking to. This may disperse their credibility because we only get one perspective and don't know whether that perspective is correct or not.