The answer is B, Jacob Riis.
Jacob Riis is most known for his pictures of an impoverished New York City, and worked for better living conditions in those areas.
First to highest rank hope this helps
Marco Polo helped European ideas about China develop was that he wrote many books and accounts of his travels to the East, and also brought back many artifacts for Europeans to observe.
Well 1st off to get the answer we need your question
