Rewrite the sentence in indirect speech.
Kumar said, "I am unwell."

Correct option is D

The statement "I am unwell" in direct speech is correctly converted to "he was unwell" in indirect speech, using the past tense to indicate that the statement was made in the past.
Rule of Conversion: Present simple in direct speech becomes past simple in indirect speech to indicate that the state or action was reported and not current.
Example: He said, "I am tired" -> He said that he was tired.