The correct answer is option C.
In sedimentary rocks, mature sedimentary grains are well sorted.
Sedimentary grains are units of sedimentary rocks and mature sedimentary grains are well-sorted because they have a uniform appearance.
More specifically, these grains are well rounded and are of similar size and shape, and also exhibit similar composition with a little variation in their appearance.
On the contrary, immature grains have a variety of shapes and sizes and are more rounded, and show a diverse composition with a large degree of variation.
Simply put, the chemical composition of sedimentary grains shows that they are either organic or inorganic material that is formed as a result of weathering of rock fragments and are carried away and deposited by wind and water, etc.
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