As a risk averse investor, which of the following four otherwise identical investments would you prefer?

Security B$,$ which is offering an expected return of $10\%$ and a standard deviation of $3\%.$

Security C$,$ which is offering an expected return of $5\%$ and a standard deviation of $3\%.$

Security D$,$ which is offering an expected return of $5\%$ and a standard deviation of $1\%.$

Security A$,$ which is offering an expected average return of $10\%$ and a standard deviation of $1\%.$