THE BAG WAS HEAVY, SO WE COULDN’T TAKE IT WITH US.A. IF THE BAG WER...

3. The bag was heavy, so we couldn’t take it with us.A. If the bag were not heavy, we could take it with us.B. Had the bag not been heavy, we would have taken it with us.C. If had the bag not been heavy, we would have taken it with us.D. Unless the bag had not been heavy, we could have taken it with us.