The statements that describe what happens to sediment when a longshore current meets a jetty are sediment is deposited on the up-current side of the jetty because water moves slower in this location (Option C) and sediment is eroded on the down-current side of the jetty because water is starved of sediment in this location (Option D).
Jetty refers to a variety of engineering structures which are connected with rivers, harbor, and coastal works and are designed to influence the current or tide or to protect the coastline from waves (breakwater). Jetties impact longshore transport of sediment and ecological processes. Sediment is eroded on the down current side of the jetty, as water contains low concentrations of sediments at the location. On the other hand, sediment is deposited on the up current side of the jetty as water movement is slower at the location which allows the time for deposition.
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