In 2017, Mario Earned $9,000 in Net Investment Income and Incurred

In 2017, Mario earned $9,000 in net investment income and incurred $14,000 of investment interest expense. Mario paid off the loan in early 2018, so he only paid $2,000 of investment interest expense in 2018. He earned $10,000 of net investment income in 2018. How much investment interest expense can Mario deduct in 2018?

A) $0
B) $2,000
C) $10,000
D) $7,000