Read the short passage about the life of Clara Barton.

Clara Barton found her calling while caring for her brother after he had been injured in an accident. Many years later, she opened the first chapter of the American Red Cross in the United States and served as its first president. The American Red Cross is a relief organization that offers assistance to victims of natural disasters.

During the Civil War, Clara collected supplies and distributed them to the Union Army. She also risked her life to care for soldiers wounded in battle. For these deeds, she was nicknamed the "Angel of the Battlefield.” When the war ended in 1865, Clara worked for the War Department helping in various ways.

Which image would be best to use on a yearbook page to show Clara Barton’s contributions to society?

a flag of the Union Army
the American Red Cross symbol
the office of the War Department
a portrait of her brother