Which of the following constitute a food-chain?

Options

A. (a) Grass, wheat and mango
B. (b) Grass, goat and human
C. (c ) Goat, cow and elephant
D. (d) Grass, fish and goat

Explanation

To determine which of the given options constitutes a food chain, we will analyze each option step by step.

### Step-by-Step Solution:

1. **Understanding Food Chains**: A food chain is a sequence that shows how energy and nutrients flow from one organism to another. It typically starts with producers (like plants) and moves up to consumers (herbivores and carnivores).

2. **Analyzing the Options**:
- **Option A: Grass, Wheat, Mango**:
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