Hitchcock's purpose is to persuade and entertain the public as shown in option B.
Hitchcock says that an effective story lets the audience play god. For that reason, he lets the audience know about the mysteries, know the elements of the narrative and get involved with the story.
For Hitchcock, persuading the public about his power is the best form of entertainment, as it can persuade the public and provoke twists that provoke surprise and positive emotions.
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