Answer:
a. natural sculpture
Explanation:
Natural sculptures include the elements and circumstances found in nature. They depend on the surroundings of the natural elements, as well as the weather, season, geography of the place, unique characteristics of it, etc. They present some modification and rearrangement of the natural elements in order to create a work of art out of them. They should also go with their environment and depend on it.
The example in the photo is the sand sculpture. It is made out of the natural elements of sand and depends on it. It is also tightly connected to the geographical environment – it would not last on a place that is very cold or underwater, but only on the dry sand, tropical climate, or the beach specifically.
