Answer :
A sandstone with a pinkish or reddish color that is the result of oxidation of iron-bearing minerals indicates the sand was deposited on land and exposed to air.
Iron oxides, a class of minerals consisting of iron and oxygen, are probably present in the rust-colored rock grains. Reddish sandstone is frequently encountered. Reddish sedimentary rock frequently implies that oxygen (in the air) was present when the sediment was exposed either before or during burial.
Different types of red rock were created by accretion in lakes and streams. Due to the reduced oxygen levels in deep water, rock that is created by deposition in deep seas is much more likely to be other colours, such as grey or black.
The correct answer is option a.
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