Not until 1932, nearly a century and a half after the first senatorial election, had a woman, Hattie Caraway of Arkansas, been elected to be a United States Senator.

a) had a woman, Hattie Caraway of Arkansas, been elected to be
b) was a woman, Hattie Caraway of Arkansas, elected as
c) was a woman, Hattie Caraway of Arkansas, elected to be
d) had a woman, Hattie Caraway of Arkansas, been elected for
e) had a woman, Hattie Caraway of Arkansas, been elected in order to be

OA: Later