Which country is known for its September celebrations and punta music?

Belize is widely recognized for its vibrant September celebrations, which include a series of festivities leading up to and following the country's Independence Day on September 21. The celebrations feature parades, cultural events, and community gatherings that highlight the nation's rich cultural diversity and heritage.

Punta music, a genre with roots in the Garifuna community, is also a significant element of Belizean culture. This lively music genre is often characterized by its energetic rhythms and is traditionally performed during festive occasions. The combination of September celebrations and punta music exemplifies the unique cultural identity of Belize, making it the correct answer for the question.

The other countries mentioned may have their unique celebrations and musical styles, but they do not specifically center on the combination of September festivities and punta music like Belize does.