The average annual return over the past 20 years for a large cap portfolio is 12%, and the standard deviation is 3.8%. The return is normally distributed Based on these numbers, what is a 68% confidence interval for the next year's returns? A. Upper bound: 14.5%; Lower bound: 5.5% B. Upper bound: 12%; Lower bound: -12% C. Upper bound: 20%; Lower bound: 9% D. Upper bound: 10%; Lower bound: 4.5% E. Upper bound: 3.8%; Lower bound: -3.8% OF. Upper bound: 15.8%; Lower bound: 8.2% What is a 95% confidence interval for the next year's returns? A. Upper bound: 27.7%; Lower bound:-17.5% B. Upper bound: 19.6%; Lower bound: 4.4% C. Upper bound: 10%; Lower bound: 4.5% D. Upper bound: 19%; Lower bound: 1% E. Upper bound: 23.5%; Lower bound: -3.5% OF. Upper bound: 20%; Lower bound: 9%