The average annual return over the period 19262021 for the S\&P 500 is 11.5%, and the standard deviation of returns is 20.1%. Based on these numbers, what is a 67% confidence interval for 2022 returns? A. 25.8%,44.2% B. 1.3%,19% C. 25.8%,50.6% D. 8.6%,31.6%