The correct statements about the artworks of Lewis Hine and Charles Sheeler are:
- They depict American industrial sites and powerful machines.
- They are examples of documentary photography or Precisionism.
Both artists were focused on themes relevant to American industry, and Hine is known for his documentary photography, while Sheeler is associated with the Precisionist movement. The other statements regarding limited changes between light and dark values and asymmetrical balance do not accurately characterize their works as broadly as the first and last points.