Please answer all parts to the question below: **I will upvote**

Does tuning a car engine improve the gas mileage? A sample of five automobiles were run to determine their mileage (BT), in miles per gallon (mpg). Then each car was run again after tune-up to measure the mpg (AT). Assume all normal distribution conditions. Determine if tune-up increases the average mpg, based on the following data: BT 33.76 34.30 29.55 30.90 24.92 AT 35.44 35.17 31.07 31.57 26.48 Write out the 91% Confidence Interval for the difference related to the means for this problem, the order being first BT & then AT. Choose the closest correct answer. O A. (- 1.601, - 0.919) O B. (-5.792, 3.2721) O c. (- 5.791, 3.2714) OD. (- 1.715, -0.805)