Correct Option: C

On 2nd February 1971 the Convention on Wetland near Ramsar coast of Iran was held (Since then 2^nd Feb was celebrated as World Wetland Day). A transition zone between dry land and water bodies wetlands helps in nourishing high biodiversity and purifying the drainage system of rivers before entering into oceans, so they are also known as "Kidneys of Ecosystem." There are 26 Ramsar Sites in India.