Ha Long Bay, the global heritage recognized twice by the UNESCO, remains one of the countrys top attractions.

A. Ha Long Bay was recognized twice by the UNESCO, and as a consequence it remains one of the country's top attractions.

B. Ha Long Bay, the global heritage which was recognized twice by the UNESCO, that remains one of the country’s top attractions.

C. Ha Long Bay, is the global heritage and was recognized twice by the UNESCO, remains one of the country's top attractions.

D. It is Ha Long Bay, the global heritage recognized twice by the UNESCO, that remains one of the country's top attractions.