The correct answer is: B. outstanding bond
An outstanding bond is a bond that has been issued and is still in circulation. It is a bond that has been sold to an investor and is not yet due to be repaid.
An unstable bond is a bond that is considered to be risky and is not likely to be repaid. It is a bond that is issued by a company or government that is in financial difficulty.
A standing bond is a bond that is issued by a company or government that is considered to be financially stable. It is a bond that is not considered to be risky and is likely to be repaid.
A stable bond is a bond that is considered to be a safe investment. It is a bond that is issued by a company or government that is considered to be financially stable and is not likely to default on its payments.
In conclusion, the correct answer is: B. outstanding bond.