Which of the following statements is true regarding the Bagmati river project?

• A. This river valley project is in Sitamarhi district
• B. The purpose of this project is irrigation, flood control, prevention of land erosion by river, drainage and development of environment.
• C. Irrigation work is done in East Champaran, Sitamarhi, Sheohar and Muzaffarpur districts through this project.
• D. all of the above are true