Which Caribbean island is known for its carnival celebrations?

Trinidad and Tobago is renowned for its vibrant and elaborate carnival celebrations, making it the correct choice. The country’s carnival is celebrated annually, typically just before Lent, and is famous for its large parades, colorful costumes, and lively music, particularly calypso and soca. This event draws thousands of locals and tourists alike, highlighting the cultural heritage and artistic expression of the Caribbean region.

Barbados is known for its own Crop Over festival, which celebrates the end of the sugar cane harvest, but it is distinct from the traditional carnival associated with Trinidad and Tobago. Jamaica has various festivals, including Reggae Sumfest, but it does not have a carnival celebration of the same scale as Trinidad’s. Haiti has rich cultural festivities, but its carnival is less internationally recognized compared to that of Trinidad and Tobago. Thus, the prominence and global recognition of Trinidad and Tobago's carnival make it the most notable among the listed options.