Final answer:
Mukharji uses sarcasm in the excerpt as the character feigns regret for not knowing someone, highlighting the absurd expectation of social acquaintance. The correct answer is option D.
Step-by-step explanation:
The satirical element Mukharji is most clearly using in the excerpt from A Visit to Europe is sarcasm. When the character expresses 'regret' in not knowing 'Jim', the tone implies a lack of genuine regret, instead conveying sarcasm regarding the significance of knowing this individual. This use of sarcasm is highlighted by the character's polite yet disinterested manner, which underscores the absurdity of the social expectation to know every acquaintance that might be mentioned.