What processes drive longshore drift and how do artificial structures alter sediment transport along coastlines?

• A. Longshore drift moves sediment alongshore due to oblique wave approach; groins, jetties, and seawalls disrupt transport, causing erosion on some shores and accretion on others.
• B. Longshore drift moves sediment offshore; artificial structures enhance cross-shore transport.
• C. Longshore drift is unaffected by wave approach angle; groins stabilize all beaches no effect elsewhere.
• D. Sediment transport is independent of coastal structures.

Answer: (A)