• Vertical Integration in Livestock Agribusiness:
• Vertical integration occurs when a single commercial enterprise controls two or more successive stages of the production, processing, and marketing chain.
• Hatchery-Broiler Contract Farming: The classic textbook example (e.g., Suguna, Venky's) where an integrator owns feed mills, breeding stock, and hatcheries, supplying day-old chicks and feed to contract farmers, and buying back finished broilers for processing and marketing.

Correct option: (2) Hatchery-broiler farming

• Assertion (A) is Correct: In agricultural enterprise financial planning, achieving an early Break-Even Point (BEP) (where total revenue equals total fixed and variable costs) minimizes operating risk and ensures early solvency.
• Reason (R) is Correct: An early BEP means cash inflows recover capital outlays faster, reducing the discounted payback period and resulting in a higher Internal Rate of Return (IRR).
• Relationship: (R) is the precise financial principle that makes an early BEP desirable in enterprise evaluation.

• Primary Stages of Wool Processing:
• Scouring: Washing greasy raw fleece with warm water, mild alkaline sodium carbonate (soda ash), and non-ionic detergents to emulsify and remove natural wool grease (lanolin), dried perspiration (suint), and dirt.
• Carbonization: Immersing heavily burry wool in a dilute acid solution ($4\text{--}7\%\;\text{H}_2\text{SO}_4$) followed by baking at $105\text{--}110^\circ\text{C}$ to dehydrate and char vegetable impurities (burrs, seeds, straw) into brittle carbon without degrading acid-resistant wool keratin.
• Conclusion: (A) and (D) only.

Correct option: (4) (A) and (D) only.