She finally got the sack. She was aware of the importance of complying with safety regulations at work only then.

She finally got the sack. She was aware of the importance of complying with safety regulations at work only then.

=> Only after she had been sacked was she aware of the importance of complying with safety regulations at work.

Dịch: Chỉ sau khi bị sa thải, cô mới nhận thức được tầm quan trọng của việc tuân thủ các quy định về an toàn tại nơi làm việc.

Chọn A