Than. You use than when comparing things, and then is used when you're describing time.
Answer:
Letter b. the tone is the author's attitude toward the subject.
Explanation:
Tone may be formal or informal or may other possible attitudes. Authors set a tone in literature by conveying emotions or feelings through words.The way a person feels about an idea/concept, event or other person can be quickly determine through their facial expressions, gesture, and in the tone of their voice.
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