The last Asian Games took place in 2002 in Busan, South Korea.

Explanation:
The Asian Games, also known as Asiad, is a multi-sport event held every four years among athletes from all over Asia. It is organized by the Olympic Council of Asia (OCA) and features various sports competitions.

In this case, the question asks about the location of the last Asian Games, which was held in 2002. Let's break down the options and explain why Busan, South Korea, is the correct answer.

a) Bangkok, Thailand: While Bangkok has hosted the Asian Games in the past, the most recent Asian Games held in Bangkok took place in 1998. Therefore, it is not the correct answer for the last Asian Games in 2002.

b) Busan, South Korea: Busan, a major city in South Korea, was the host city for the 2002 Asian Games. It is an important port and economic center in South Korea and has the necessary infrastructure to host a large-scale sporting event. Busan was chosen as the host city, and the Asian Games in 2002 were successfully held there.

c) Hiroshima, Japan: Hiroshima, a city in Japan, has never hosted the Asian Games. While Japan has hosted the Asian Games in the past, the most recent Asian Games held in Japan took place in Hiroshima in 1994. Therefore, it is not the correct answer for the last Asian Games in 2002.

d) Beijing, China: Beijing, the capital city of China, has also hosted the Asian Games in the past. However, the most recent Asian Games held in Beijing took place in 1990. Therefore, it is not the correct answer for the last Asian Games in 2002.

In conclusion, the last Asian Games took place in 2002 in Busan, South Korea.