Nongovernmental organizations are a unregulated pirate groups that operate off the somali coast b nonprofit agencies that aid human interests and that are not attached to any government c militia groups that rely on coups to create effective social and political change d refugees or asylees seeking political asylum as a group

Non-governmental organizations are B) non-profit agencies that aid human interests and that are not attached to any government.

Explanation:

Non-governmental organizations, commonly known as NGOs, are non-profit companies, which means that they don't generate money for profit, or to become wealthy.  These organizations typically receive donations from other companies or even individuals, and also throw fundraisers to be able to have enough funds to carry out their activities.  

NGOs aim to aid different humanitarian causes or projects and they exists all over the world.  Some target health or social issues, while others are focused on environmental problems.  They are called non-governmental because they are independent from the government of any country.  NGOs can also vary in size, some are quite small, but others are very large organizations that you have probably heard about.

Some of the best known NGOs are: Doctors Without Borders, CARE, Wikimedia Foundation, Greenpeace, World Wildlife Fund, among others.