At fourteen, Dorothea was teaching school at Worcester, Massachusetts. A short after she had begun teaching, she set up a school for young girls in her grandparents' home. Stress was placed on moral (道德) character at Dorothea's school, which she conducted until she was thirty-three.
She was forced to give up teaching at her grandparents' home, however, when she became ill. A few years of inactivity followed.
In 1841 Dorothea began to teach again accepting a Sunday school class in the East Cambridge, Massachusetts, prison. Here she first came upon insane people (精神病人)locked up together with prisoners.
In those days insane people were treated even worse than prisoners. There were only a few madhouses in the entire country. Therefore prisons, poor houses, and houses of correction were used to keep the insane.
Dorothea Dix made a careful investigation (调查) of the inhuman treatment of the insane, which was considered unfeminine for a woman to devote herself to such work at this time. But this did not stop Dorothea Dix from providing proper medical care for the insane.
Gradually, because of her investigations conditions were improved. More than thirty mental institutions were founded or rebuilt in the United States because of the hard work. Dorothea also spread her investigations to England and to other parts of Europe.
During the Civil War, Dorothea served as superintendent (负责人) of women hospital nurses in the Union Army. When the war was over, she returned to her work of improving conditions for in- sane people.
This article is mainly about _______.

A. social problems of the nineteenth century
B. how Dorothea Dix set up schools and hospitals investigating insane people
C. how Dorothea Dix devoted herself to education
D. how Dorothea Dix devoted herself to (the work of) improving conditions for insane people