Which sentence contains an error in the third-conditional contrast between a past condition and a past result?
If the mechanic had tightened the valve, the tank would not have leaked overnight.
If Sora had taken the earlier lift, she would have reached the summit before dusk.
If the sample had been labelled, the researchers would find its origin yesterday.✓Correct answer
If the baker had lowered the oven temperature, the crust would not have burned.
Explanation
The researchers sentence is erroneous because would find presents the discovery as non-past even though yesterday fixes the result in completed time. A third-conditional result for that occasion needs would have followed by the participle.