the market has a standard deviation of $25\%$ whereas the XYZ has a standard deviation of $30\%.$ The correlation coefficient between the stock return and the market return is $0\mathrm{.}7.$ The beta of stock XYZ is $($to decimal please$)$

a$.0\mathrm{.}11$

b$\mathrm{.}0\mathrm{.}58$

c$\mathrm{.}0\mathrm{.}84$

d$\mathrm{.}0\mathrm{.}05$