Mary's 2018 form 1040, line 1 is $25,000; line 2b is $400 Schedule 1, line 12 is $500 and her AGI is $25,900. What is the amount of her earned income for purposes of figuring her child and dependent care credit?

a)$25,500

b) $25,400

c) 25,900

d) 25,000