Finance Question

5. (TCO D) 

Which is the standard deviation of the returns on the index from 2000 to 2009 closest to?

Year End Index Realized Return (R - R)(R - R)2
2000  23.6% 14.78%0.0218448
2001 24.7%15.88%0.0252174
2002 30.5% 21.68% 0.0470022
2003 9.0% 0.18% 3.24E-06
2004 -2.0% -10.82% 0.0117072
2005 -17.3% -26.12%0.0682254
2006 -24.3%  -33.12% 0.1096934
2007 32.2% 23.38% 0.0546624
2008 4.4% -4.42% 0.0019536
2009 7.4% -1.42% 0.0002016

A) 19.5%
B) 20.5%
C) 3.8%
D) 8.8%