Option (क) is correct because the provided context explicitly mentions that the question is of great importance as it gives the matter an opportunity to bloom and move forward ('यह बात को खिलने का, आगे बढ़ने का अवसर देता है'). This directly translates to expanding the conversation or topic, making 'बात को विस्तार देने वाले प्रश्नों का' the right choice.