Final answer:
The question regarding which country has only one union cannot be directly answered with the provided context, which instead offers various historical and social facts about other topics such as immigrant labor policies, industrialization, health insurance, Confucianism, Taoism, demographic structures, and social attitudes. The correct answer is c. China.
Step-by-step explanation:
The question presented asks about a specific detail related to the labor and organizational structure of countries. Specifically, it questions which country has only one union. However, the provided context does not include information to accurately answer this query; instead, other historical and social facts are provided.
For example, immigrant laborers from China were entirely excluded from the United States in 1882, which is a significant historical event related to labor and immigration policies.
Germany was initially unable to industrialize due to a lack of free laborers, and it was also the first country to provide health insurance for workers. In terms of cultural practices, Confucianism and Taoism have been primarily practiced in China.
If we consider demographic structures, economically underdeveloped countries have the greatest proportion of young individuals. And when it comes to social attitudes, Sweden is considered to be very liberal in its views towards sex. The correct answer is c. China.