Final answer:
Singapore has the least seasonal variation in its climate among the given options, with a tropical rainforest climate and consistent temperatures throughout the year.
Step-by-step explanation:
The city with the least seasonal variation in its climate among the options given is Singapore.
Singapore has a tropical rainforest climate characterized by consistent temperatures throughout the year and high humidity. The city experiences abundant rainfall throughout the year, with no distinct dry season. The average temperature ranges from 77 to 86 degrees Fahrenheit (25 to 30 degrees Celsius) with little variation.
In contrast, the other cities listed - Kuala Lumpur, Yangon, and Colombo - have a monsoon climate, which includes distinct wet and dry seasons.