Terai Region Terai is a low land region containing some hill ranges. Looking out for its coverage, it covers 17% of the total area of Nepal. The Terai (also spelt Tarai) region begins at the Indian border and includes the southernmost part of the flat, intensively farmed Gangetic Plain called the Outer Terai.
Its between C and D for me.But I think D is the answer.
Answer:
open defection_ and lack of sanitation and hygiene in general_is an important factor that cause various diseases: the most common being diarrhea and intestinal worm infections but also typiod, cholerae, hepatitis, polio,trachoma, and others.