Answer:
C. the only valid threat to structural damage
Step-by-step explanation:
A storm surge is the rise in sea level that occurs when hurricanes or typhoons happens in a given area. This rise in sea level leads to the water to flood the given area when it comes onshore, thereby leading to the damage of structures found within the area.
For example, all the building found within an area where storm surge occurs would be exposed to the threat of structural damage.