单项选择题

梵蒂冈就是在圣彼得教堂附近,是罗马教皇的宫殿,这是一个国中之国。______

A.Vatican is near to St.Peter’s. It is the palace of the Pope in Rome. It is a country within a country.
B.Standing beside St.Peter’s, Vatican, the palace of the Pope in Rome, is a country within a country.
C.Vatican which stands in the neighborhood of St.Peter’s is the palace of the Pope in Rome and is a country within a country.
D.Not far from St.Peter’s was the Vatican, the palace of the Pope in Rome, constituting a country within a country.