Question

why is manufacturing considered a secondary industry? it transforms raw materials into finished goods. it extracts resources to sell to primary industries. it supplies raw materials for subcontractors. it is limited to about 20 sectors.

Explanation:

The primary industry involves extracting raw materials. The secondary industry takes those raw materials (from primary industry) and transforms them into finished goods. Manufacturing fits this definition as it uses raw materials (e.g., steel from mining - a primary activity) to make cars (a finished good). The option "It extracts resources to sell to primary industries" is wrong because extraction is primary industry. "It supplies raw materials for subcontractors" is incorrect as manufacturing typically creates finished products, not just supplies raw materials (sub - contractors might be part of a larger manufacturing chain but that's not the core of why manufacturing is secondary). "It is limited to about 20 sectors" is an arbitrary and incorrect reason related to sector count, not the nature of secondary industry.

Answer:

It transforms raw materials into finished goods.