D. The correct form would be:
"What have they accomplished so far?"
Answer:
of* is the answer to your question
If I remember correctly the both have different set of values so your answer would be B
Answer:
The correct answers are "A mechanical doll could have done what she did."
(A)
And
"She was decoration, giving people a bit of the royal glamor without ever doing any real work."
(D)