Hel spit is found along the western portion of Gdańsk bay in Poland. It has lots of sand particles which forms dunes as a result of its location. It is situated near a beach which contains very strong wind and water forces.
These forces are responsible for the movement and formation of the sand particles and the Hels pit is as a result of wind and water erosion present in the area.
The answer would be A because water is what causes breezes at night and day. Also water absorbs most heat and takes long to release it. My point is that water is what causes the temperature to vary.