Economies are typically divided into three sectors:
Primary Sector: Involves the extraction of raw materials from the earth (e.g., agriculture, mining, fishing).
Secondary Sector: Involves the transformation of raw materials into finished goods. This includes manufacturing, construction, and processing.
Tertiary Sector: Involves providing services rather than producing goods.
Based on this classification:
(A) Insurance, (C) Trade, and (D) Banking are all service-based activities and belong to the tertiary sector.
(B) Manufacturing is the core activity of the secondary sector.