In 2013, Betsy and Dennis (who file a joint return) had an interest expense of $10,000 on a loan that was used to purchase a variety of stock and bonds (all producing taxable income). Assume further that, in 2013, Betsy and Dennis had net investment income of $2,000. Assume they itemize deductions, what is their maximum interest expense deduction in 2013?
a. $0
b. $2,000
c. $6,000
d. $10,000