Final answer:
Bangkok has its main rainy season from June to October due to the southwest monsoon.
The correct option is D.
Step-by-step explanation:
The city in Southeast Asia with a fall rainy season is Bangkok. Based on the information, Bangkok experiences its main rainy season from June to October, coinciding with the southwest monsoon, which brings heavy rain clouds from over the Indian Ocean.
This seasonal pattern matches the definition of the fall rainy season for the city in question.
The correct option is D.