Which of the following indviduals qualify for the earned income credit for 2013?

a. Thomas is single, is 21 years of age, and has no qualifying children. His income consists of $9,000 in wages.

b. Shannon, who is 27 years old, maintains a household for a dependent 11-year-old son and is eligible for head-of-household tax rates. Her income consists of $16,050 of salary and $$50 of taxable interest (Shannon's AGI is $16,100).

c. Keith and Susan, both age 30, are married and file a joint return. Keith and Susan have no dependents. Their combined income consists of $28,500 of salary and $100 of taxable interest (their AGI is $28,600)

d. Colin is a 26-year-old, self-supporting, single taxpayer. He has no qualifying children and generates earnings of $9,000.