The rocks have been melted by a magma. The rocks have been broken by faults. The rocks have been weathered by water. The rocks have been folded by pressure.
I am hesitating between 4 options to answer the following question, which option should I choose?
Question: Which is the best evidence that rocks found deep underground were once exposed at the surface?
Possibilities:
- The rocks have been melted by a magma.
- The rocks have been broken by faults.
- The rocks have been weathered by water.
- The rocks have been folded by pressure.

The rocks have been weathered by water.