The capital of Japan I have read that this huge city has over 30 million people is Tokyo.
Which is the best way to revise this sentence?
A: The capital of Japan—I have read that this huge city has over 30 million people is Tokyo.
B: The capital of Japan—I have read that this huge city has over 30 million people—is Tokyo.
C: The capital of Japan, I have read that this huge city has over 30 million people, is Tokyo.