Question

on the map, #3 is identifying which mountain system? the rocky mountains the columbian mountains the appalachians mountains the sierra madres

Explanation:

The Appalachians are located on the eastern - side of the United States. On the given map, the mountain system marked as #3 is on the eastern part of the country, which matches the location of the Appalachians. The Rocky Mountains are in the western - central part (marked as #1), the Columbian Mountains are in the north - western part of North America (not shown in this map in detail), and the Sierra Madres are in Mexico.

Answer:

C. The Appalachians Mountains