B. Suppliers.
A current liability is a debt or obligation that a company is expected to pay within one year or within its operating cycle, whichever is longer. Suppliers are a common source of current liabilities because a company may purchase goods or services on credit and have to pay the supplier within a short period of time, typically within 30 to 90 days. The other options, such as credit unions, banks, and mortgage companies, are financial institutions that a company may have a relationship with, but they are not sources of current liabilities.