Rocks were dissolved by water. Lava deposited and then cooled. The remains of plants and animals were trapped. Air, water, and minerals combined.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Gas and oil come from deposits of petroleum deep within the earth. What caused these deposits to form?
Possibilities:
- Rocks were dissolved by water.
- Lava deposited and then cooled.
- The remains of plants and animals were trapped.
- Air, water, and minerals combined.

The remains of plants and animals were trapped.