Which sources contribute to a river system

Explanation:

we can conclude that groundwater, rivers, and streams are the water sources that contribute to a river system.The source of a river or stream is the original point from which the river flows. It may be a lake, a marsh, a spring or a glacier. This is where the stream starts. The source is the farthest point of the river stream from its estuary or its confluence with another river or stream.Evaporation /Transpiration to Precipitation to Runoff/Infiltration. Once precipitation occurs it can either go to runoff or infiltration. What are the three main parts (zones) of a river system? The tree main zones of a river system include sediment production, sediment transportation, and sediment deposition.

specific gravity is the density of a substance divided by the density of water. since (at standard temperature and pressure) water has a density of 1 gram/cm3, and since all of the units cancel, specific gravity is usually very close to the same value as density

so "c" is the answer

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