Sedimentary rocks are not very old. Organisms live only in areas with sedimentary rock. Organisms can be preserved in sedimentary rock. Sedimentary rocks are found only at the surface of the ground.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Why are most fossils found in sedimentary rocks?
Possibilities:
- Sedimentary rocks are not very old.
- Organisms live only in areas with sedimentary rock.
- Organisms can be preserved in sedimentary rock.
- Sedimentary rocks are found only at the surface of the ground.

Organisms can be preserved in sedimentary rock.