Explanation:

• Statement 1 is incorrect: Central Water Commission is an attached office of the Ministry of Jal Shakti, Department of Water Resources, River Development and Ganga Rejuvenation.

• Statement 2 is incorrect: Central Water Commission CWC is headed by a chairman, with the status of Ex-Officio Secretary to the Government of India.

• Central Water Commission is an attached office of the Ministry of Jal Shakti, Department of Water Resources, River Development and Ganga Rejuvenation.

• The Commission is entrusted with the general responsibilities of initiating, coordinating and furthering in consultation of the State Governments concerned, schemes for control, conservation and utilization of water resources throughout the country, for purpose of Flood Control, Irrigation, Navigation, Drinking Water Supply and Water Power Development.

• It also undertakes the investigations, construction and execution of any such schemes as required.

• Central Water Commission CWC is headed by a chairman, with the status of Ex-Officio Secretary to the Government of India.

• The work of the Commission is divided among 3 wings namely, Designs and Research (D&R) Wing, River Management (RM) Wing and Water Planning and Projects (WP&P) Wing.

• Headquarters: New Delhi

Hence option 4th is correct.