Correct option is A
The correct option is (a).
• Explanation: In the sentence, “after” is followed by the noun phrase “the storm”.
• A word that comes before a noun or pronoun to show relation in time, place, or direction is called a preposition.
• Here, “after” shows the time relation between the storm and the clearing of the sky.
Grammar Rule involved (English/ Hindi):
• A preposition is followed by a noun or pronoun and shows a relationship with another part of the sentence.
• “After” जब noun phrase के पहले आकर समय-संबंध दिखाता है, तब वह preposition होता है।
Meanings of other options:
• Adverb – A word that modifies a verb, adjective, or another adverb (क्रिया विशेषण)
• Interjection – A word expressing sudden emotion (विस्मयादिबोधक)
• Conjunction – A word used to join clauses or words (समुच्चयबोधक)
So the correct answer is (a)