【填句补文】The weather of the Caribbean Sea is almost always warm and sunny．Sandy beaches line the coasts of many islands. ________. Many tourists arrive on cruise ships.
A
They are Cuba，Puerto Rico，Jamaica，and Hispaniola.
B
The Caribbean Islands are known by several names.
C
Some of these islands are no more than tiny slivers(小片)of exposed coral.
D
This is why millions of tourists visit the islands each year.
