Security A has an expected return of 7%, a standard deviation of returns of 35%, a correlation coefficient with the market of -0.3, and a beta coefficient of -1.5. Security B has an expected return of 12% , a standard deviation of returns of 10% , a correlaion with the market of 0.7, and a beta coefficeint of 1.0.Which security is riskier and Why?

Can you please show work, I am struggling like crazy with this class.