What is the best way to combine theses sentences using an appositive phrase? (The Grand Canal in China is a man-made waterway.It is the oldest in the world.The canal is still used today.)
A: The Grand Canal, which is the oldest man-made waterway in the world, is still used today.
B: The Grand Canal in China is a man-made waterway, still used, that is the oldest in the world.
C: The Grand Canal in China, the oldest man-made waterway in the world, is still used today.
D: The Grand Canal-which is and old, man-made waterway in China-is still used today.