6690. He listened to my request with indifference.

✅ The correct answer is option D.
Caution : care taken to avoid danger or mistakes.

Displeasure : a feeling of annoyance or disapproval.

Concern : relate to; be about.

Disinterest : lack of interest in something.

Indifference : lack of interest, concern, or sympathy.

Synonym of Indifference is Disinterest