For the Year Ended December 31, 2015, Sheniqua, a Single

For the year ended December 31, 2015, Sheniqua, a single professional, reported the following:
Net investment income from interest, $14,000
Other expenses unrelated to the generation of interest, $6,000
Investment interest expense on funds borrowed in 2014 to purchase stocks and bonds, $15,000
What is the maximum amount that Sheniqua can deduct in 2015 as investment interest expense?

A) $6,000.
B) $8,000.
C) $14,000.
D) $15,000.