20. The automobile industry is a pillar industry in the secondary industry of our city. Koreans invested in Yancheng to build a car factory because Yancheng (①) has advanced technology.

Yancheng is a prefecture-level city under the jurisdiction of Jiangsu Province. It is located in the middle of Jiangsu Province and borders the Yellow Sea in the east. It is one of the coastal cities in Jiangsu Province and the largest city under the jurisdiction of Jiangsu Province. The municipal area 1779 square kilometers, governs two county-level cities, Dongtai and Dafeng, and five counties, namely Jianhu, Sheyang, Funing, Binhai and Xiangshui. The urban area consists of Du Yan, Tinghu and Yancheng Development Zone. 1954 villagers' committees and 483 residents' committees, which is the largest city with the second largest population in Jiangsu province. It has successively won the titles of civilized city in Jiangsu Province, excellent tourist city in China, national advanced city in science and education, and national double-support model city. In recent years, Koreans have invested and built automobile factories in Yancheng, because Yancheng has advanced technology and many talents. Abundant labor force and low price; Great market potential and rapid development; The land price is low and the government supports it.

Therefore, choose: d.