This year, Carol, a single taxpayer, purchased a vacation home for $400,000 using an equity debt of $350,000 on her principal residence. Carol has no other debt on her principal residence. Carol paid $16,000 of interest on the debt this year. How much of this interest is deductible assuming Carol itemizes her deductions?

a. $16,000

b. $0

c. $10,000

d. $125,000