Martha files a return as a single taxpayer. She received $$12\mathrm{.}000$ of social security benefits, $$14,000$ of interest income, and $$8,000$ of nontaxable municipal bond interest. How much is the provisional income? Her social security base$-$threshold is $$25,000.$

Seleccione una:

a$.$

$20,000$

$$ b$.$

$28,000$

$0.$

$24,000$

$$ d$.$

$26\mathrm{.}000$