What did edward weston use to create contrast in the photograph shell 1927

In the photograph "Shell" Weston used a

difference in value

to create contrast.

Ithink the answer is d) once again don't kill me if i got the answer wrong > _<

The theme of social protest remained a consistent focus for jacob lawrence throughout his career. in the 1960s lawrence was inspired by news reports and photographs, including images of segregated lunch counter sit-ins and stories of the   freedom riders in the civil rights movement. from the 1970s onward, lawrence's work focused less explicitly on contemporary social issues.