An individual has $$35,000$ invested in a stock with a beta of $0\mathrm{.}8$ and another $$40,000$ invested in a stock with a beta of $1\mathrm{.}4.$ If these are the only two investments in her portfolio, what is her portfolio's beta?

Question $4$ options:

A$)$

$1\mathrm{.}15$

B$)$

$1\mathrm{.}13$

C$)$

$1\mathrm{.}12$

D$)$

$1\mathrm{.}16$

E$)$

$1\mathrm{.}10$