Critic: A novel cannot be of the highest quality unless most readers become emotionally engaged with the imaginary world it describes. Thus shifts of narrative point of view within a novel, either between first and third person or of some other sort, detract from the merit of the work, since such shifts tend to make most readers focus on the author. Which one of the following is an assumption necessary for the critic's conclusion to be properly drawn? ["Most readers cannot become emotionally involved with a novel's imaginary world if they focus on the author.", "Most readers regard a novel's narrative point of view as representing the perspective of the novel's author.", 'Most readers become emotionally engaged with the imaginary world described by a novel only if the novel is of the highest quality.', 'Shifts in narrative point of view serve no literary purpose.']