Suppose that the investor decides to form a portfolio consisting of three assets as follows: $10\%$ invested in Stock A$,30\%$ invested in Stock B$,$ and $60\%$ invested in a risk free asset that has a return of $6\%.$ Stock A returns $12\%$ and stock B returns $18\%.$ What is the expected return for this portfolio?

a$-10\mathrm{.}2\%$

b$-12\mathrm{.}0\%$

c$-6\mathrm{.}6\%$

d$-12\mathrm{.}6\%$