Answer the questions below using the following information on stocks A$,$ B$,$ and C$.$

A B C

Expected Return $20\%21\%10\%$

Standard Deviation $12\%10\%10\%$

Beta $1\mathrm{.}82\mathrm{.}20\mathrm{.}8$

Assume the risk$-$free rate of return is $3\%$ and the expected market return is $12\%$

a$.$ Calculate the required return for stocks A$,$ B$,$ and C$.$

b$.$ Assuming an investor with a well$-$diversified portfolio, which stock would the investor want to add to his portfolio?

c$.$ Assuming an investor who will invest all of his money into one security, which stock will the investor choose?