This Region in China Includes Three Cities of Over 5

This region in China includes three cities of over 5 million inhabitants (Hong Kong, Guangzhou, and Shenzhen) ; five cities with more than 1 million inhabitants (Zhuhai, Huizhou, Foshan, Zhongshan, and Dongguan) ; and a number of cities that each contain approximately half a million inhabitants, such as Macau. Identify the region.

A) Shanghai
B) Northeast China
C) Yangtze River Delta
D) The Greater Pearl River area
E) Taiwan