What is the expected return for a portfolio with a beta of $0\mathrm{.}5?$

Group of answer choices

$7\mathrm{.}5\%$

$15\mathrm{.}0\%$

$5\mathrm{.}5\%$

$10\mathrm{.}0\%$

$12\mathrm{.}5\%$