Looking at the timeline of the "Butter Artists of the Iowa State Fair", we can see that John K. Daniels started in 1911 followed by J. E. Wallace in 1913. Then, in 1957, Earl Frank Dutt took over followed by Norma Lyon in 1960. And last among them is Sarah Pratt who started in 2006.
So, according to the active years of their 'service', the shortest duration of work as the state artist is John K. Daniels who got replaced by J. E. Wallace in 1913. He worked for just 2 years while the others worked for more than 3 or more years.
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While C is important, it is not going to be helpful for your topic. Imagine yourself writing a story; you need a main idea. The main idea in your essay is "in what ways is sleep necessary to our health?" because the other choices are little. Overall, D is what controls the other ones. If you want a sleep essay, you need to add how sleeping is necessary for health.