The correct answer is: E. No error
The sentence is grammatically correct. The use of the past perfect subjunctive “would have” in the first clause (“Ketaki would have surely got the job”) is correct, as it is used to express a hypothetical situation that did not happen. The use of the past perfect subjunctive “would have” in the second clause (“if she would have attended the interview”) is also correct, as it is used to express a condition that was not met. The use of the simple past tense “attended” in the third clause is also correct, as it is used to express a completed action in the past.
The sentence could be rephrased as follows:
“If Ketaki had attended the interview, she would have surely got the job.”
This sentence is also grammatically correct, but it is not as concise as the original sentence.