A rock is classified as non-living and abiotic. So, the correct option is A.
The criteria for something to be considered a biotic component, it must either be a producer, consumer or decomposer of some useful component of the ecosystem.
Rocks do not produce anything that can be consumed by another living organism to sustain its life. Rocks produce minerals which have economic importance but not biological importance.
Rocks also do not consume anything in an ecosystem. They occupy a space to just exist in an area and nothing else.
Rocks do not directly decompose anything. Their presence can create the conditions for some biological matter to be turned into fossils but they are not directly involved. Hence rocks are non-living things and abiotic components of an ecosystem and are classified as such.
Therefore, the correct option is A.
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