ganga action plan for controlling pollution in ganga started in 1985 1981 1987 1989

The correct option is 1.
The Ganga Action Plan or GAP was a program launched in April 1985 in order to reduce the pollution load on the river. But the efforts to decrease the pollution level in the river became more after spending Rs 9017 million Therefore, this plan was withdrawn on 31 March 2000. The steering Committee of the National River Conservation Authority reviewed the progress of the GAP and necessary correction on the basis of lessons learned and experiences gained from the GAP; phase 2 schemes have been completed under this plan. A million litres of sewage is targeted to be intercepted, diverted and treated. Phase-II of the program was approved in stages from 1993 onwards, and included the following tributaries of the Ganges: Yamuna, Gomti, Damodar and Mahananda. As of 2011, it is currently under implementation.