13. During 2021, single taxpayer Margaret Mason, age 64 and blind, received wages of $30,000, interest income of $1,000 from the Ajax National Bank and $2,000 from a Commonwealth of Virginia bond, and Social Security benefits of $12,000. How much, of the Social Security benefit amount will be taxable on Margaret's Form 1040? $12,000 0 A B C 10,200 6,000 E None of the above