og11中的一道题目

49. As an actress and, more importantly, as a teacher of acting, Stella Adler was one of the most influential artists in the American theater, who trained several generations of actors including Marlon Brando and Robert De Niro.

(A) Stella Adler was one of the most influential artists in the American theater, who trained several generations of actors including

(B) Stella Adler, one of the most influential artists in the American theater, trained several generations of actors who include

(C) Stella Adler was one of the most influential artists in the American theater, training several generations of actors whose ranks included

(D) one of the most influential artists in the American theater was Stella Adler, who trained several generations of actors including                                         （C）

(E) one of the most influential artists in the American theater, Stella Adler, trained several generations of actors whose ranks included

大侠帮助分析一下 为什么在正确答案中要加一个whose ranks呢

非常感谢!

那请问ranks在这里是什么意思呢?

非常感谢!!

Jennifer, Where did you get your OG11? In my OG11 (bought from Amazon), 49th is not that one you mentioned.

Are there two editions for OG11?

following is 49th from my book:
49. Many house builders offer rent-to-buy programs that enable a family with insufficient savings for a conventional
down payment to be able to move into new housing and to applay part of the rent to a purchase later.

ranks include我也不是很明白，同问了

我是看分词选的C，只有C是ing表主动的

如果非要用who的话，时态又不对

所以选的C