HE DID NOT PREPARE WELL FOR THE JOB INTERVIEW, SO HE FAILED. A. IF...

6. He did not prepare well for the job interview, so he failed.

A. If he had prepared well for the job interview, he wouldn't have failed.

B. He wouldn't have failed the job interview if he would have prepared well.

C. If he had prepared well for the job interview, he wouldn't fail.

D. He wouldn't fail the job interview if he prepared well.