Place the dairy chain in the correct production sequence: Cow, Grass, Milk, Curd, Butter.

Introduction / Context:
This sequence models an agricultural/food-processing pipeline from input feed to finished dairy product. Correct sequencing depends on biological and culinary processes.

Given Data / Assumptions:

• Items: Curd (i), Grass (ii), Butter (iii), Milk (iv), Cow (v).
• Assume standard processing: milk → curd → butter (via churning/clarification).

Concept / Approach:
A cow eats grass, producing milk. Milk can be fermented into curd (yogurt). Butter is then churned from curd/cream. Therefore: Cow → Grass → Milk → Curd → Butter would be incorrect because the cow comes before grass in that listing; the correct order is Cow is the organism that eats Grass, so we start with Cow or Grass? Trace causality of production: (Cow) consumes (Grass) to produce (Milk), which becomes (Curd), then (Butter). Thus, (v) → (ii) → (iv) → (i) → (iii).

Step-by-Step Solution:

Verification / Alternative check:

Why Other Options Are Wrong:

• (b) places Butter too early.
• (c) starts with Milk without prior production.
• (d) starts with Grass before Cow as a sequence item; the pipeline being asked usually follows “producer → input → products.”

Common Pitfalls:

• Confusing narrative order (what the cow eats) with production order (what is produced from what).
• Reversing curd and butter.

Final Answer:
(v), (ii), (iv), (i), (iii)