The correct answer is - D. regional unity or identity.
The people from the Caribbean are a mixture of multiple ethnicities from the African continent, and some elements from the Europeans as well. Their languages, cultures, way of life have been influenced by multiple different sources and they represent a very interesting mixture of cultures. Mostly the people from the Caribbean countries, even though they speak different languages and are parts of different countries, they identify themselves by the region itself, not by ethnicity or the nation, and it is this unity that is very interesting and that holds them together as communities.