Identify the conjunction in this sentence. I drove fast, lest I may be late.

Conjunctions are words that join together other words or groups of words. Option C is correct because it is the conjunction. Option A is wrong because it is the subject of this sentence and it says who does the action here.  Option B is wrong because it is the verb and says what action was done by the subject in this sentence. Option D is wrong because it is the adjective.