Researchers studying the relationship between screen time and developmental scores of children in Canada selected a random sample of 2,441 children. For each child, the researchers recorded the child's screen time, in hours per day, when they were 2 years old (x) and their scores on a developmental test, in points, when they were 5 years old (y). Higher scores on the developmental test are better. The 95 percent confidence interval for the slope of the least-squares regression line for predicting scores on the developmental test based on screen time was (-0.13, -0.02). The conditions for inference were met, and the researchers concluded that increased screen time is associated with lower scores on the developmental test. Which of the following provides the best reason that supports the researchers' conclusion? (A) This was a 95% confidence interval, which is a high level of confidence. (B) The sample size was large. (C) The researchers took years to complete the study. (D) The confidence interval for the slope of the regression line does not contain 0. (E) The confidence interval for the slope of the regression line consists entirely of negative numbers.