I'll give you a question, please answer with step-by-step reasoning process. The study showed driving while sleep deprived led to as many what accidents as being drunk?\nOptions:\n- dangerous\n- stressful\n- being followed by\n- honk the horn\n- deadly

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Sleep deprived makes person fall asleep while driving. Falling asleep during driving results in deadly accidents.
The answer: deadly.
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