Step 1: Understanding the sectors of economy
- Primary sector: Involves activities that depend directly on natural resources, such as agriculture, fishing, forestry, and mining.
- Secondary sector: Involves industries where raw materials are processed or manufactured into finished goods.
- Tertiary sector: Provides services such as trade, banking, education, and transport.
- Quaternary sector: Deals with knowledge-based services like information technology, R&D, consultancy.
Step 2: Identify the correct sector
Since the question specifies "produced mainly by natural process," it directly refers to the Primary sector.
Step 3: Conclusion
Thus, an item produced mainly by natural processes belongs to the Primary sector.
The correct answer is option (A).
The value of $\dfrac{1+\cot^2 \theta}{1+\tan^2 \theta}$ will be: