You are considering a portfolio of three stocks with $30\%$ of your money invested in company $x,45\%$ of your money invested in company $Y,$ and $25\%$ of your money invested in company $Z.$ If the betas for each stock are $1\mathrm{.}22$ for company X$,1\mathrm{.}46$ for company $Y,$ and $1\mathrm{.}03$ for company $Z,$ what is the portfolio beta?

A$.1\mathrm{.}28$

B$.1\mathrm{.}33$

C$.1\mathrm{.}24$

D$.1\mathrm{.}00$