Quaternary activities are related to intellectual services and involve research, development, and the production of information. These activities are centered around innovation, high-tech services, education, and research that help in solving problems and developing new technologies. 
- Option (A) is incorrect because the extraction of minerals is related to primary activities, not quaternary activities. 
- Option (B) is incorrect because increasing the value of raw materials into finished products is characteristic of secondary activities, not quaternary. 
- Option (C) is correct because quaternary activities focus on research and development, which are fundamental to the growth of knowledge-based industries. 
- Option (D) is incorrect as quaternary activities are not directly related to serving all people of society in a general sense, but more focused on specialized knowledge and services.
Thus, the correct answer is (C) It is concerned with research and development.
In the given reaction sequence, the structure of Y would be: