_______ her mistake, the actress made a public apology and decided to give up her career.
Having been realised
Correct answer: A
Reduce the adverb clause: If the adverb clause has the same subject as the main clause, and the action in the adverb clause occurs before the action in the main clause, then shorten it by omitting the subject, movement word to having + PP form.
Original sentence: After the actress had realised, she made a public apology and decided to give up her career.
After realizing her mistake, the actress publicly apologized and decided to retire.