The correct option is D Soak pits
Irrigation system is used to supply water to agricultural lands through canals, sprinklers etc. Efficient irrigation systems maximize the efficiency and minimize the capital requirements.
Common irrigation systems used are:
∙ Drip irrigation
∙ Sprinkler irrigation
∙ Furrow irrigation
However, soak pits ar covered pit like structures that helps drain runoff water into ground. They are not used to irrigate farmlands.