The fossils were formed at the top of a mountain. The fossils were formed during a rainstorm. The area had many volcanic eruptions. The area was once covered by water.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: A scientist discovered a fossil of an ocean plant in the rocks of a desert. What does the discovery of this fossil most likely tell the scientist?
Possibilities:
- The fossils were formed at the top of a mountain.
- The fossils were formed during a rainstorm.
- The area had many volcanic eruptions.
- The area was once covered by water.

The area was once covered by water.