An industry engaged in the extraction of raw materials and its conversion into semi-finished goods is called industry.

Analyze the question: The question asks for the type of industry that takes raw materials (already extracted) and converts them into semi-finished goods.

Explain the concept: Industries are grouped by what they do:

• Extractive industries (mining, fishing, farming, logging) take raw materials from nature.
• Manufacturing industries turn materials into finished goods that consumers can use, such as cars, clothes, and packaged food.
• Processing industries treat or refine raw materials and turn them into semi-finished or intermediate goods. Examples are refining crude oil, ginning cotton into lint, and milling logs into planks.
• Construction and service industries build structures or provide services.

Solution:

1. Mining only extracts raw materials from the ground and does not convert them into semi-finished goods, so A is not the best fit.
2. Manufacturing produces finished goods, not semi-finished ones, so B is not it.
3. Processing converts raw materials into semi-finished goods. For example, crude oil becomes petrol or kerosene, and raw cocoa beans become cocoa paste or butter. This matches the question.
4. "Conversion" is not a standard classification of industry in Economics, so D is out.

Note on the wording: The question says the industry is "engaged in the extraction of raw materials and its conversion," which also mentions extraction. No option covers both extraction and conversion perfectly.

Answer: C. processing

Exam tip: Remember the sequence Extraction → Processing → Manufacturing. Processing gives semi-finished goods, and manufacturing gives finished goods. When a question mentions "semi-finished," think processing.