6226. It was a facetious remark which totally failed to make any impression.

✅ The correct answer is option B.
Irrelevant : not connected with or relevant to something.

Joking : humorous or flippant.

Reconciliatory : intended or likely to restore friendly relations.

Meaningless : having no meaning or significance.

Facetious : treating serious issues with deliberately inappropriate humour; flippant.

Synonym of Facetious is Joking