I think the correct answer from the choices listed above is the last option. There is a vast amount of salt water on Earth because water is an excellent solvent. Salt readily dissolves in water so it goes to oceans and seas. Hope this answers the question.
There is huge amount of the salt water level on the earth as the water is known as the excellent solvent. The salt gets readily dissolve in the water as it goes in the oceans and the sea.
The water is act as the polar solvent as it behave either the negative or the positive charge particle on the solute. Water is fit for dissolving a wide range of substances, which is the reason it is such a decent dis-solvable.
Furthermore, water is known as the "general dis-solvable" on the grounds that it disintegrates a larger number of substances than some other liquid.This enables the water particle to become pulled in to numerous other various types of the molecules.
