"Climate Action Tracker" which monitors the emission reduction pledges of different countries is a :

Option (a) is correct because the Climate Action Tracker is an independent scientific analysis produced by a coalition of research organizations, specifically Climate Analytics and NewClimate Institute, to track government climate action against Paris Agreement goals. While it is tempting to associate such monitoring with official intergovernmental bodies like the UNFCCC or UNEP, it is a non-governmental tool designed to provide objective, external accountability. The core concept tested is the landscape of international climate governance and the specific independent mechanisms used to monitor global emission reduction pledges.