What is the BEST way for Natalia to combine sentences 10 and 11 in order to conclude the paragraph? A. For she became the first female professor to be named to a permanent role at Columbia University, she taught there from 1972 to 1980.
For she became the first female professor to be named to a permanent role at Columbia University, she taught there from 1972 to 1980.

B. Then she became the first female professor to be named to a permanent role at Columbia University, she taught there from 1972 to 1980.
Then she became the first female professor to be named to a permanent role at Columbia University, she taught there from 1972 to 1980.

C. Then she became the first female professor to be named to a permanent role at Columbia University, where she taught from 1972 to 1980.
Then she became the first female professor to be named to a permanent role at Columbia University, where she taught from 1972 to 1980.

D. Then she became the first female professor to be named to a permanent role at Columbia University, once she taught there from 1972 to 1980.