Correct option is C
The highlighted word "exhilarating" means causing one to feel very excited and animated. "Thrilling" closely matches this as it also refers to causing great excitement and happiness.
Synonyms: exciting, stimulating, electrifying, invigorating.
Antonyms: boring, dull, unexciting, depressing.
Meanings of other given words:
• Peaceful: free from disturbance; tranquil, not involving excitement.
• Prominent: important; famous or conspicuous.
• Eager: wanting to do or have something very much, typically with a sense of anticipation or enthusiasm, but not directly synonymous with exhilarating.
Thus, "thrilling" is the most appropriate synonym for "exhilarating."