Explanation:

- Commercial bill: These are short-term, negotiable instruments that businesses use to finance their working capital needs. They are backed by physical goods and are often discounted by banks.

- Commercial papers: These unsecured, short-term debt instruments are issued primarily by large, creditworthy companies. They offer an alternative to bank borrowing for these entities.

- Call money: This is very short-term borrowing, usually for a day, involving banks. It's commonly used in the interbank market rather than by companies.

- None of the above: This option would not apply, as we have relevant items listed.

Your correct answer is Commercial papers. .