Ecological cycle directly driven by sunlight is

Answer: Option C

Ecological cycle directly driven by sunlight is Hydrologic.
Ecological system is a natural process in which elements are continuously cycled in various forms between different compartments of the environment. These have many biogeochemical cycles operating as a part of the system, for example, the water cycle, the carbon cycle, the nitrogen cycle, etc. All chemical elements occurring in organisms are part of biogeochemical cycles.
Hydrologic cycle is a biogeochemical cycle that describes the continuous movement of water on, above and below the surface of the Earth.