The Castillo de San Marcos, the oldest masonry fort in the United States, is located on the Matanzas Bay in St. Augustine, Florida. Which group of words is the appositive phrase?
A the oldest masonry fort in the United Statesthe oldest masonry fort in the United States
B on the Matanzas Bayon the Matanzas Bay
C is locatedis located
D The Castillo de San Marcos