Mario is a new tax client. In reviewing his $2022$ tax return prepared by his former CPA $($because that is what you do when you get a new tax client$),$ you see that Mario earned $$9,000$ in net investment income and incurred $$14,000$ of investment interest expense for last tax year $(2022).$ Mario paid off the loan in early $2023,$ so he only paid $$2,000$ of investment interest expense in $2023.$ He earned $$10,000$ of net investment income in $2023.$ How much total investment interest expense can Mario deduct in $2023?$

A$)$ $$2,000$

B$)$ $$10,000$

C$)$ $$7,000$

D$)$ $$0$