NGOs, which have worked to solve environmental, social, and health problems, are largely funded by

Private individuals and organizations.

Explanation:

Non-governmental organizations are the institutions that runs independent of any governmental assisstance. NGO's are formed to serve any social purposes such as environmental, social, and health problems. NGO's may be on local, national, or international levels.

The NGO's are funded, largely by, individuals and private organizations. These private individuals and organizations are volunteers who come forward willingly to support the mission or the cause of NGO's.

Therefore, private individuals ad organizations is the correct  answer.

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