The answer would be: <em>B) The hills, at one time, were under water.</em>
Explanation:
- Trilobite were once a marine creature. Trilobite's are extinct, that being said they are no longer living.
- Marine is basically another word for Sea, which Trilobite were a marine creature.
Based on those two statements above, I can conclude that the hill's were once under water.
That being said, the answer is: <em>B) The hills, at one time, were under water.</em>
I hope this helps! :)
-LizzyIsTheQueen