Answer: C. Artistic pieces that involve raw materials found at the site of the piece
Explanation: Given that artistic answers are offered, earthworks or earth art, land art are offered, is an artistic movement that appeared in America and Great Britain in the 60's and 70's of the 20th century but expanded to other countries. This artistic expression involves the use of natural materials that found on site. Those materials from which the artistic works of relief shape are made on the ground itself can be vegetation, wood, stones, soil, etc, and the location of works is usually in a natural environment far from the populated areas.
Earthworks are artistic pieces that involve raw materials found at the site of the piece. They are also known as Earth arts.
Earthworks are beautiful work or art of materials obtain from nature on the site of the work.
They are the artistic work done on natural materials such as rocks, sands, earths, water, leaves, etc. on a relatively large scale.
It is also known as environmental art or land art.
One famous example of earthwork is the Spiral Jetty of Utah.
Thus the correct option is (c).
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