Consider the following realized returns:

Year	Index Realized Returns
2011	30.50%
2012	9.00%
2013	-2.00%
2014	-17.30%
2015	-27.00%
2016	27.90%
2017	-5.10%
2018	-0.02%
2019	-5.15%
2020	-11.30%

Suppose that you want to use the 10 year historical average return on the Index to forecast the expected future return on the Index. The 95% confidence interval for your estimate of the expect return is closest to:

a		-11.60% to 11.50%
b		-15.4% to 21.5%
c		-7.3% to 12.2%
d		-25.0% to 5.68%