The answer is B. Coupon bond.
A coupon bond is a type of bond that has coupons attached to it. These coupons are certificates that represent a certain amount of interest that the bondholder is entitled to receive. The coupons are usually paid semi-annually, and the interest rate is usually fixed.
Registered bonds, on the other hand, are bonds that are registered in the name of the owner. This means that the interest payments are made directly to the owner of the bond, and the bond cannot be transferred without the owner’s signature.
Mortgage bonds are bonds that are secured by a mortgage on real property. This means that if the bond issuer defaults on the bond, the bondholders can foreclose on the property and sell it to recover their investment.
Collateral trust bonds are bonds that are secured by a pledge of securities. This means that if the bond issuer defaults on the bond, the bondholders can sell the pledged securities to recover their investment.
In conclusion, a coupon bond is a type of bond that has coupons attached to it. These coupons represent a certain amount of interest that the bondholder is entitled to receive. The coupons are usually paid semi-annually, and the interest rate is usually fixed.