The correct answer is: A. original maturity.
Original maturity is the date on which a bond matures and the principal amount is repaid to the bondholder. It is the date that is decided at the time of issuance of the bond and is legally permissible.
Permanent maturity is a type of bond that does not have a maturity date. These bonds are issued with the intention of being held until maturity, and the principal amount is not repaid until the bond is called or redeemed.
Artificial maturity is a type of bond that has a maturity date that is shorter than the actual maturity of the bond. This is done to make the bond more attractive to investors, as it gives them the option of selling the bond before it matures.
Valued maturity is the date on which a bond is expected to mature, based on its current market value. This date is not always the same as the original maturity date, as the market value of a bond can change over time.