Read the excerpt from "Lewis Hine Helps a Nation See the Light."

One of Hine's photo essays received a lot of attention. It was a study of immigrants entering the United States through Ellis Island. At that time, many Americans had strong anti-immigrant attitudes. However, Hine's photographs portrayed the new arrivals with such respect and dignity that they disproved many of the stereotypes of the day. It was this Ellis Island photo essay that drew the attention of the National Child Labor Committee.
The author's main purpose for including this information in the text is to show that
A. Hine had already completed one photo essay of immigrants entering the United States.
B. many Americans had strong negative attitudes about the newly arrived immigrants.
C. Hine changed his attitude about immigrants after he took their photographs.
D. Hine had changed an existing cultural mindset with his photographs.