Concept:Coastal features are landforms found along the coast and formed by the sea (waves, currents and tides), for example cliffs, beaches, bays, headlands, lagoons and spits.
Solution:A cliff is a steep rock face formed by wave erosion; a beach is a deposit of sand or pebbles; a lagoon is a body of shallow water cut off from the sea by a sand bar.
A valley is a long low area between hills, usually cut by a river. It is an inland (river) landform, not a coastal feature.
Key point: The paper's option C was 'Tide'. A tide is the rise and fall of the sea, a movement of water and not a landform, so it could also be read as 'not a coastal feature'. Option C has been changed to 'Lagoon' so that only Valley is correct.
Answer:Option D (Valley)