Concept:
Cost of milk production includes all expenses incurred in maintaining dairy animals and producing milk.
Step 1: Feed Cost (A)
• Major component (60–70% of total cost).
• Includes fodder, concentrates.
Step 2: Labour Cost (B)
• Includes wages for workers.
• Required for feeding, milking, cleaning.
Step 3: Veterinary Expenses (D)
• Includes vaccination, treatment.
• Essential for maintaining animal health.
Step 4: Market Price (C)
• Does not affect cost of production.
• It affects profit, not cost.
Step 5: Final Evaluation
• Direct cost factors: A, B, D
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\boxed{\text{Option (C)}}
\]