The correct answer is: A. Bond.
A bond is a fixed income instrument that represents a loan made by an investor to a borrower (typically corporate or governmental). The borrower issues bonds to raise money and agrees to pay the bond holders a fixed interest rate for a specific period of time until the loan is repaid. Bonds are considered to be relatively safe investments, and they are often used by investors to generate income.
A bank note is a type of paper money that is issued by a central bank. Bank notes are typically used as a medium of exchange and a store of value. They are considered to be legal tender, which means that they are accepted as payment for goods and services.
A coupon is a document that entitles the holder to receive a payment, typically in the form of interest or dividends. Coupons are typically attached to bonds, stocks, and other financial instruments.
A check is a written order to a bank to pay a specified amount of money to the person or company named on the check. Checks are typically used to make payments for goods and services.
In conclusion, a bond is a document that shows proof of legal ownership of a financial security.