Ken, a single taxpayer, has a gross income of $79,685. He claims one exemption and can take a deduction of $1,257 for medical expenses, a deduction of $2,181 for interest on his mortgage, an adjustment of $800 for alimony, a deduction of $1,419 for property taxes, an adjustment of $1,722 for business expenses, and an adjustment of $2,511 for contributions to his retirement fund. The standard deduction for a single filer is $5,700, and exemptions are worth $3,650 apiece. Using the table below, how much does Ken owe in income tax?

a.
$12,663
b.
$12,825
c.
$12,675
d.
$12,838