Which statement explains why ammonites are a good example of an index fossil? (1 point)

SE TOOLS
O Ammonites existed in a small geographic area.
• Ammonites existed long before the dinosaurs.
O Ammonites existed for a relatively limited period of time.
O Ammonites existed only in the oceans

The statement that explains why ammonites are a good example of an index fossil is: "Ammonites existed for a relatively limited period of time."