Concept:A coastline of emergence is caused by a relative fall in sea level or an uplift of the land.
Explanation:When sea level drops, the former seabed becomes dry land.
This leads to the formation of a raised beach.
A raised beach is an old shoreline that is now elevated above the high tide mark.
It forms when marine deposits are permanently uplifted above the sea.
In contrast, estuarian, dalmatian, and ria coasts are formed by a rise in sea level.
These are created when rivers valleys are flooded, marking coastlines of submergence.
Therefore, only a raised beach fits the description of an emergent coastline.
Answer:A raised beach (Option A) is the correct choice.