In a study on life satisfaction in urban and rural areas of a province, 453 people in the urban area and 345 people in the rural area were randomly selected and the subjects were asked whether they were satisfied with their lives. 92 people in urban areas and 56 people in rural areas stated that they were not satisfied with their lives. Which of the following is the point estimate of the difference in the ratios of those who are satisfied with their lives in the urban and rural areas of this province?    a) 0.02  B) 0.18  NS) -0.04  D) -0.18  TO) 0.04

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