Answer: (a) 1 and 2 Only
Explanation: Statement 1 and 2 are correct. Splash erosion occurs when raindrops hit bare soil and Sheet erosion refers to the uniform movement of a thin layer of soil across an expanse of land devoid of vegetative cover. Statement 3 is incorrect as rill erosion evolves into gully erosion due to continued erosion and not only due to increased duration or intensity of rain.