Which one among the following places is situated close to the Pearl River Estuary in Asia?

The Pearl River Estuary is located in southern China where the Pearl River (Zhu Jiang) flows into the South China Sea. Both Hong Kong and Macau are situated on this estuary — Hong Kong on the eastern side and Macau on the western side. Among the choices given, Hong Kong is the standard textbook answer being a major global city at the mouth of the Pearl River. Bangkok lies on the Chao Phraya River in Thailand, and Singapore is at the southern tip of the Malay Peninsula — neither is near the Pearl River Estuary.