Please provide the best answer for the statement

Please provide the best answer for the statement.

1. Goldsworthy chose sand as his medium, which he considered basic to Egyptian civilization as the source of its building materials.
2. To the artist, sand also reflects the impermanence of individual human existence—a reflection of the cyclical nature of all things that is a keystone of ancient Egyptian thought. This impermanence is further emphasized in the piece by its existing only in photographic form once the original, physical sculpture was dismantled.
3. Sand allows for flow, representing cultural energies and emblematizing the flow of the Nile, the source of life in ancient Egypt.