Besides advertising new products and services, commercial photography also

Choices to this question are:
A. documents fashion trends at different times in history.
B. allows for many artists to work who might otherwise be unemployed.
C. encourages the use of new and innovative techniques in photography.
D. accomplishes all of the above.

Besides advertising new products and services, commercial photography also: documents fashion trends at different times in history ; allows for many artists to work who might otherwise be unemployed;and,  encourages the use of new and innovative techniques in photography. 

The answer then is letter D.

Riffin tells a story about photographing elephants in a wildlife sanctuary in africa. he says that the photographer brought back more than just an amazing story.