Select the most appropriate ANTONYM of the highlighted word.
The heads turned to the back, where Dr. Pfizer, surrounded by the female troupe of dancers, beamed with exhilaration in a dazzling ocean-green dress paired with stunning jewellery.

Correct option is B

The correct antonym of the given word is (b) lackluster.
Exhilaration: A feeling of excitement, joy, or elation. (उल्लास/उत्साह)
Example: Her eyes sparkled with exhilaration after hearing the news.
Lackluster: Lacking in vitality, excitement, or interest; dull. (निस्तेज)
Example: His lackluster performance disappointed everyone.
Synonyms of exhilaration: joy, thrill, ecstasy, elation.
Antonyms: dullness, boredom, lackluster, gloom.
Meanings of other given options:
· (a) pristine – pure or unspoiled (निर्मल).
· (c) gingerly – cautiously (सावधानी से).
· (d) luminous – glowing or shining (दीप्तिमान).