If the expected returns of two stocks are the same but the standard deviations of the returns

Question:

If the expected returns of two are the same but the standard deviations of the returns differ, which security is to be preferred?

Stocks
Stocks or shares are generally equity instruments that provide the largest source of raising funds in any public or private listed company's. The instruments are issued on a stock exchange from where a large number of general public who are willing...