pls help with hw question

A researcher wishes to estimate the average blood alcohol concentration (BAC) for drivers involved in fatal accidents who are found to have positive BAC values. He randomly selects records from 75 such drivers in 2009 and determines the sample mean BAC to be 0.17 g/dL with a standard deviation of 0.070 g/dL. Complete parts (a) through (d) below. . . ... nts (Use ascending order. Round to three decimal places as needed.) O A. The lower bound is and the upper bound is . The researcher is 10% confident that the population mean BAC is in the confidence interval for drivers involved in fatal accidents who have a positive BAC value. O B. The lower bound is and the upper bound is . The researcher is 90% confident that the population mean BAC is in the confidence interval for drivers ess involved in fatal accidents who have a positive BAC value. O C. The lower bound is and the upper bound is . The researcher is 90% confident that the population mean BAC is not in the confidence interval for brary drivers involved in fatal accidents who have a positive BAC value. ions (d) All areas of the country use a BAC of 0. 10 g/dL as the legal intoxication level. Is it possible that the mean BAC of all drivers involved in fatal accidents who are found to have positive BAC values is less than the legal intoxication level? Explain. O A. Yes, it is possible that the mean BAC is less than 0.10 g/dL, because it is possible that the true mean is not captured in the confidence interval and it is highly probable. O B. Yes, it is possible that the mean BAC is less than 0. 10 g/dL, because it is possible that the true mean is not captured in the confidence interval, but it is not likely