Industries are broadly classified into three sectors: primary, secondary, and tertiary. This is the standard three-sector model used in economics and geography to categorise all economic activities.
Primary industries extract raw materials directly from nature. Examples include farming, fishing, mining, forestry, and quarrying.
Secondary industries process and manufacture raw materials into finished or semi-finished goods. Examples include food processing, textile manufacturing, steel production, and construction.
Tertiary industries provide services rather than tangible goods. Examples include banking, education, healthcare, transport, and retail trade.
The option listing "primary, secondary, and manufacturing" is incorrect because manufacturing is a subset of the secondary sector, not a separate broad classification alongside it. Using manufacturing as a third category creates an overlap with secondary.
The other two options (fishing, mining, and food processing; or mining, furniture making, and cocoa processing) list specific industries rather than broad classifications. These are examples of industries within the primary and secondary sectors, not the categories themselves.
