Does a Sole Proprietor Have Unlimited Liability for Any of the Liabilities

Does a sole proprietor have unlimited liability for any of the liabilities of the business?

A) No.
B) Yes,but only for ordinary recurring types of expenses.
C) Yes,but only for foreseeable expenses and liabilities.
D) Yes,but only for debts if the owner specifically assumed personal liability when the debt was incurred.
E) Yes,for all debts of the business.