Maurice and Judy have one natural daughter, age $4,$ and adopted twin boys, age $8.$ Their adjusted gross income on their joint return is $$120,000.$ If they take the standard deduction, what is their tax liability after any allowable tax credits in $2013?$

a$.$ $$14,335$

b$.$ $$11,933$

c$.$ $$11,433$

d$.$ $$11,335$