The correct answer is debt.
Debt is an obligation to pay a sum of money that is owed to someone else. It can be incurred through borrowing money, taking out a loan, or making a purchase on credit. Debt can be a useful tool for financing large purchases or investments, but it can also be a burden if it is not managed carefully.
When someone is under a lot of debt, they may be forced to sell their property in order to pay off their debts. This can be a difficult decision, but it may be necessary in order to avoid bankruptcy or other financial problems.
Option A, account, is incorrect because an account is a record of financial transactions. It is not a source of debt.
Option B, debt, is the correct answer because debt is an obligation to pay a sum of money that is owed to someone else.
Option C, loan, is incorrect because a loan is a type of debt. It is not a source of debt.
Option D, credit, is incorrect because credit is a system that allows people to borrow money. It is not a source of debt.