Choose the most suitable option to replace the highlighted part of the sentence:
Had I known about the traffic, I will leave early.

Correct option is A

The correct substitution of the highlighted words is (a) would have left earlier.
Explanation: The clause “Had I known…” is an inversion form of the third conditional (If I had known…). In the third conditional, we talk about an unreal past condition and its unreal past result. Therefore, the main clause must use would have + V3. “I will leave” is future and does not match the past-unreal condition.
Grammatical rule used:
· Third Conditional: If + had + V3, then would have + V3
· Inversion form: Had + subject + V3, would have + V3
· Example: Had she studied harder, she would have passed the exam.
· Information booster / exceptions related to grammatical topic:
· Had I known… is inverted conditional, same meaning as If I had known….