In the following problem, assume 2013 values listed in the table of marginal tax rates below.

Tax Rate Single Married Filing Jointly Married Filing Separately Head of Household 10% up to $8925 up to $17,850 up to $8925 up to $12,750 15% up to $36,250 up to $72,500 up to $36,250 up to $48,600 25% up to $87,850 up to $146,400 up to $73,200 up to 125,450 28% up to $183,250 up to $223,050 up to $111,525 up to $203,150 33% up to $398,350 up to $398,350 up to $199,175 up to $398,350 35% up to $400,000 up to $450,000 up to $225,000 up to $425,000 39.60% above $400,000 above $450, above $225,000 above $425,000 Standard deduction $6,100 $12,200 $6,100 $8,950 Exemption (per person) 3,900 $3,900 $3,900 $3,900

Use the table above to answer the question below.

A married couple who claim the standard deduction are in the 28% marginal tax bracket. Which of the following will reduce their tax bill by $280?

They have a $280 tax deduction.

They make a $280 donation to charity.

They qualify for a $1000 tax credit.

They qualify for a $280 tax credit.