Solution:The main objective of the National Water Mission is "conservation of water, minimizing wastage and ensuring its more equitable distribution both across and within States through integrated water resources development and management". National Water Mission is a part of the National Action Plan on Climate Change which was started on 30 June, 2008. The five identified goals of the mission are(i) Comprehensive water database in public domain and assessment of impact of climate change on water resource
(ii) Promotion of citizen and state action for water conservation augmentation and preservation
(iii) Focused attention to vulnerable areas including over-exploited areas
(iv) Increasing water use efficiency by 20%
(v) Promotion of basin level integrated water resource management.
Hence (b) is the correct answer.