Rex and Dena are married and have two children, Michelle (age seven) and Nancy (age five). During 2022, Rex earned a salary of $27,500, received interest income of $300, and filed a joint income tax return with Dena. Dena had $0 gross income. Their earned income credit for the year is: a. $0. b. $5,840. c. $5,903. d. $6,164.