Lori purchased educational savings bonds to help finance her son's education. She paid $4,000 for the bonds. The bonds matured at $6,000, and the son used $2,500 to pay his tuition for the first semester. The son quit school after one semester and Lori used the remaining money to buy her son a car. If Lori's AGI is $55,000, how much interest is included in her gross income?

a. $0 b. $833 c. $1,167 d. $750 e. $2,000