How do both jetties and seawalls manage beach erosion?

both bring sand to the beach from offshore.

both use plants to keep sand on the beach.

both are hard structures that reduce erosion causes by waves.

both provide flood protection in the event of high waves.

Both are hard structures that reduce erosion causes by waves.

Option C

Explanation:

Jetties and sea walls are constructed near the beach to reduce erosion caused by waves. Sea wall is a hard wall construction built on the beach to protect the nearby land structures from being affected by waves. It is built very high to protect from wave topping.

Jetty is normally a wooden construction built to berth the ships. It is constructed to artificially increase the beach size which can be used for recreational purposes. Both are constructed using stones, cement and it provides as a protection from coastal flooding.