请大神帮忙分析一下sc，新题prep

A.       Appointed to the position in1950 by Harry S. Truman, Edith Sampson became the first African American womanto be named an official representative to the United Nations.

B.       In Edith Sampson, Harry S.Truman appointed the first African American woman to be named an officialrepresentative to the United Nations in 1950.

C.       Harry S. Truman appointed EdithSampson, in 1950, to the position as the first African American woman officialrepresentative to the United Nations.

D.       The first African Americanwoman to be named an official representative to the United Nations, Harry S.Truman appointed Edith Sampson to the position in 1950

E.        Appointed by Harry S. Truman in1950 as the first African American woman to be named an official representativeto the United Nations was Edith Sampson

有3个问题

1. 看不懂题，特别是appointed to the position in 1950 by Harry S. Truman这句话不知道什么意思

2. 对于这道题的逻辑方向完全迷失，不知道重点是什么

3.请大神详细给分析一下每一个选项哪里错了

感谢

本题选a