Let's look at why the other options are incorrect: - A. It can only be found on land: This is incorrect. Fault lines exist both on land and under the ocean.- B. It is where an earthquake starts: This is true, but it's not the most complete answer. Fault lines are where earthquakes originate, but they are also breaks in the Earth's crust.- C. It cannot be found under the sea: This is incorrect. Most of the Earth's surface is covered by oceans, and fault lines exist beneath these oceans.
Answer:D.It is a break in the Earth's crust.