Option-2, "Organisation that promote common interest," describes a Public Interest group. These groups work towards promoting and protecting the interests of the general public, rather than focusing on the interests of a particular section or group. They aim to address and resolve issues that affect society as a whole. Public Interest groups advocate for policies and actions that benefit the larger population, such as environmental protection, consumer rights, and social justice. They often engage in activities like conducting research, lobbying, campaigning, and raising awareness to bring attention to these issues and drive meaningful change. Public Interest groups play a crucial role in shaping public policy and ensuring that the common good is prioritized.