Each sentence links an unreal past event to a result explicitly true now. Which sentence contains an error in that mixed-conditional contrast?
If Omar had taken the coastal post, he would have lived beside the sea now.✓Correct answer
If Mei had kept the patent, she would own the design rights now.
If we had planted the windbreak ten years ago, the orchard would be safer now.
If Caleb had renewed his licence in June, he would drive the rescue van now.
Explanation
The coastal-post sentence is erroneous because would have lived presents a past result despite the word now. Its unreal appointment belongs in the past, but the seaside residence is a present consequence and needs would plus the base form.