The slit is a part of the bedrock.
What is bedrock?
The deposit of solid rock that is essentially buried beneath the soil and other fractured or segregated substances is referred to as bedrock.
The parent substance (the source of rock and mineral particles) for soil and regolith is the bedrock, which is made up of igneous, metamorphic, or sedimentary rock.
Bedrock is a source of nitrogen in the Earth's nitrogen cycle. An outcrop is a bedrock accumulation that occurs at the Earth's surface.
Thus, we can conclude that option A, the slit is correct.
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