The Index of Exposure to Radioactive Waste and the Cancer

The index of exposure to radioactive waste and the cancer mortality rates (deaths per 100,000) were recorded for nine different geographic regions.Use the regression analysis and summary statistics provided below to determine a 95% confidence interval for the average cancer mortality rate of a county whose index of exposure is 6.81
Dependent variable is: Cancer Mortality Rate
R-squared = 85.8%
S = 14.00993 with 9 - 2 = 7 degrees of freedom

A) 164.3 to 190.9 deaths per 100,000
B) 143.4 to 211.8 deaths per 100,000
C) 174.2 to 180.9 deaths per 100,000
D) 167.9 to 185.9 deaths per 100,000
E) 141.8 to 213.3 deaths per 100,000