The word “acknowledged” in paragraph 2 could best be replaced by

Câu hỏi :

Clara Barton became known as "The Angel of the Battlefield" during the American Civil War. Born in Oxford, Massachusetts in 1821, Clara Barton's interest in helping soldiers on the battlefield began when she was told army stories from her father. Another event that influenced her decision to help soldiers was an accident her brother had. His injuries were cared for by Barton for 2 years. At the time, she was only Il years old. Barton began teaching school at the age of 15. She taught for 18 years before she moved to Washington, D.C. in 1854.