The following are gold's annual rate of return for the last 30 yearswhat is gold's Sharpe ratio if the risk-free rate has been 4.5%?

A

0.011

B

0.056

C

0.072

D

0.381

Year	% Return
1990	-2.49
1991	-9.62
1992	-5.80
1993	17.35
1994	-2.09
1995	1.10
1996	-4.43
1997	-21.74
1998	-0.61
1999	1.18
2000	-6.26
2001	1.41
2002	23.96
2003	21.74
2004	4.97
2005	17.12
2006	23.92
2007	31.59
2008	3.41
2009	27.63
2010	27.74
2011	11.65
2012	5.68
2013	-27.79
2014	-0.19
2015	-11.42
2016	9.12
2017	11.85
2018	-1.15
2019	18.83