Calypso music, which often discusses social issues, originated in which Caribbean country southeast of Grenada?

Calypso music originated in Trinidad and Tobago, a country located southeast of Grenada in the Caribbean. This genre has its roots in the African traditions brought to the islands by enslaved people and has evolved over the years to encompass various influences, including European and Indian music. Calypso often serves as a medium for social commentary, reflecting the political and cultural issues within society, making it a significant form of expression in Trinidad and Tobago's history and lifestyle.

Other nations mentioned may have their own unique musical styles or contributions to Caribbean music but do not have the same historical and cultural significance attached to calypso as Trinidad and Tobago does. For instance, Jamaica is primarily known for reggae and ska, while Barbados has its own music styles like soca and jump-up, and Saint Lucia has a rich tradition of folk music. Thus, Trinidad and Tobago stands out as the birthplace of calypso music, affirming the choice as the correct answer.