Lori Klemm 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 Klemm used the remaining money to buy her son a car. If Klemm's AGI is $25,000, how much interest should she include in gross income?
a. $0
b. $833
c. $1,167
d. $750
e. $2,000