Choose the option that is the correct indirect form of the sentence. “Who is it?” Vikram asked, his euphoria fading.

With his euphoria fading, Vikram asked who it was.

The correct indirect form of the sentence is: With his euphoria fading, Vikram asked who it was.

The other options are incorrect:

• "With a faded euphoria Vikram asked who is it." is incorrect because the verb tense is incorrect. The indirect speech sentence should be in the past tense, not the present tense.
• "As his euphoria faded, Vikram asks as to who was it." is incorrect because the verb tense is incorrect and the modal verb "as to" is not necessary.
• "With his euphoria faded, Vikram asked who it is." is the correct answer.