Ureotelism
The water available to terrestrial organisms is lower, hence they need to convert toxic nitrogenous waste such as ammonia into a lesser toxic form. This will require lesser water for excretion.
The organisms which excrete nitrogenous body wastes majorly in the form of urea are known as ureotelic organisms. Some examples are- terrestrial amphibians, marine fishes and mammals.
Final answer: (B) Urea