Question #N48

The Great Wall of China, one of the most impressive feats of engineering in the world, was constructed over many centuries, and itโ€™s a popular tourist destination, attracting millions of visitors each year.

Which choice completes the sentence so that it conforms to the conventions of Standard English?
A. And it is a popular tourist destination, attracting millions of visitors each year.
B. As it is a popular tourist destination, attracting millions of visitors each year.
C. It is a popular tourist destination, attracting millions of visitors each year.
D. Because it is a popular tourist destination, attracting millions of visitors each year.