Correct option is C
The correct indirect form is "Ankit asked Ashna if she knew that the annual meeting had been postponed."
· In the sentence "Ankit said to Ashna, 'Do you know that the annual meeting has been postponed?'" the direct speech is converted to indirect speech.
· In indirect speech, the question format changes to a 'if/whether' structure, and the verb tense usually shifts backwards.
· The present perfect "has been postponed" becomes past perfect "had been postponed" in indirect speech.
· Additionally, the pronoun changes from 'you' to 'she' to match the perspective of Ashna being spoken about rather than directly addressed.
· Therefore, the correct conversion is: "Ankit asked Ashna if she knew that the annual meeting had been postponed."