The given sentence shows that the author is persuasive in nature.
Bias means favouring an individual, getting inclined in decision making or supporting someone in his behaviour. This inclination of authority will affect the judgement.
In the given statement, Marks twain's famous book name was given. The author has always influenced readers with his purposeful and engaging content. In the statement, it is said that he is persuasive which is correct, as he easily connects readers with his thought.
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