Which sentence is the correctly written compound sentence?
a. The Statue of Liberty is located on a small, uninhabited island called Liberty Island.
b. Liberty Island is a small, uninhabited island where the Statue of Liberty is located.
c. Liberty Island is a small, uninhabited island, it is best known as the location of the Statue of Liberty.
d. Liberty Island is a small, uninhabited island, but it is best known as the location of the Statue of Liberty.