The correct answer is (a). The National Ganga River Basin Authority (NGRBA) was constituted in October 2008 by the Government of India. The NGRBA is a statutory body responsible for planning, coordinating, and implementing the Ganga Action Plan (GAP) for the cleaning and conservation of the Ganga River. The GAP is a comprehensive plan that aims to improve the water quality of the Ganga River and its tributaries, reduce pollution, and protect the river’s ecosystem. The NGRBA is headed by the Prime Minister of India and has representatives from the central and state governments, as well as from non-governmental organizations. The NGRBA has made significant progress in cleaning the Ganga River. However, there is still a lot of work to be done. The NGRBA is committed to working with all stakeholders to achieve the goals of the GAP.
Option (b) is incorrect because the NGRBA was not constituted in February 2009.
Option (c) is incorrect because the NGRBA was not constituted in October 2009.
Option (d) is incorrect because the NGRBA was not constituted in March 2010.