Which of the following interest expense amounts is not deductible in the current year?
a. Education loan interest of $2,000, assuming the taxpayer has income of $30,000.
b. Home equity loan interest of $6,000, on a loan of $90,000, the proceeds of which were used to purchase a sports car and designer clothes.
c. Investment interest expense of $10,000, assuming the taxpayer has no investment income.
d. Qualified residence interest of $70,000 on a $1 million loan used to purchase a luxury apartment in downtown San Diego.