Use the Following Information,which Describes the Possible Outcomes from Investing

Use the following information,which describes the possible outcomes from investing in a particular asset,to answer the following question(s) .
State of the Economy Probability of the States Percentage Returns
Economic recession 25% 5%
Moderate economic growth 55% 10%
Strong economic growth 20% 13%
-The standard deviation of returns is

A) 8.00%.
B) 7.63%.
C) 4.68%.
D) 2.76%.