D. $1,500
We can calculate the amount of student loan debt Vaughn has by subtracting her assets from her net worth.
Net worth = $2,500
Assets:
- Personal possessions = $4,000
- Credit card bills = $-1,000 (negative because it's a liability)
- Debt = Net worth - Assets
Since debt can't be negative, we need to make it positive.
Debt = $2,500 (positive)
Therefore, Vaughn owes $1,500 on her student loans.