the water of oceans. the ice on ponds. the trunks of trees. rocks in the ground.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: The fossils of dinosaurs that lived millions of years ago can be found in
Possibilities:
- the water of oceans.
- the ice on ponds.
- the trunks of trees.
- rocks in the ground.

rocks in the ground.