Which three details should be included in a summary why Barton believes there is a need for an American red cross

In that summary there should be details about who Clara Barton is, her role in the American civil war and how she was presented with the red cross.

Explanation:

Clara Barton was a nurse and philanthropist who had a strong update during the civil war, going directly to the battlefields to help treat and recover wounded soldiers. In addition, she continued these activities in the post-war period, in addition to assisting in the search for missing and buried soldiers in random graves that the family did not know where they were.

On a trip to Switzerland, she was introduced to the red cross and was delighted with the work that was done by that organization. She knew that the USA needed an institution like this, as there were many people in need in the country, so she started efforts to establish the American Red Cross.

It must be B.