Answer: Option C.
Bedrock
Explanation:
Bedrock consist of hard rock that has not been weathered because bedrock is the hard rock that is found under surface materials like soil and are components of quartzite, limestone , basalt and granite. It is a solid and it is bound very tight. It also form parent rock and it can remain on the top of the soil which later weathered and form soil and can be taken away by wind, water, gravity e.t.c.
