Answer: Bond issuers

**Explanation:** - **Bond issuers** have the primary decision for labeling a security as a green bond. They self-declare that the bond proceeds will be used for environmentally beneficial projects. - **Credit rating agencies** may provide green bond assessments or ratings, but they don't make the initial labeling decision. - **Self-regulatory organizations** may establish standards or frameworks for green bonds, but the labeling decision remains with the issuer. In the green bond market, issuers voluntarily label their bonds as "green" based on their intended use of proceeds for environmental projects, though they often seek external verification to enhance credibility.

Author: LeetQuiz Editorial Team