Besides advertising new products and services, commercial photography also

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Besides advertising new products and services, commercial photography also

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

In addition to announcing new products and services, commercial photography: documents fashion trends at various times in history; it allows many artists to work who might otherwise be unemployed, and encourages the use of new and innovative techniques in photography.

The answer then is the letter D.